161700651 has 64 divisors (see below), whose sum is σ = 295142400. Its totient is φ = 85390848.

The previous prime is 161700641. The next prime is 161700661. The reversal of 161700651 is 156007161.

161700651 is a `hidden beast` number, since 1 + 6 + 1 + 7 + 0 + 0 + 651 = 666.

It is an interprime number because it is at equal distance from previous prime (161700641) and next prime (161700661).

It is not a de Polignac number, because 161700651 - 2⁶ = 161700587 is a prime.

It is a super-2 number, since 2×161700651² = 52294201067647602, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is not an unprimeable number, because it can be changed into a prime (161700601) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 189141 + ... + 189993.

It is an arithmetic number, because the mean of its divisors is an integer number (4611600).

Almost surely, 2^161700651 is an apocalyptic number.

161700651 is a deficient number, since it is larger than the sum of its proper divisors (133441749).

161700651 is a wasteful number, since it uses less digits than its factorization.

161700651 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 945 (or 939 counting only the distinct ones).

The product of its (nonzero) digits is 1260, while the sum is 27.

The square root of 161700651 is about 12716.1570845912. The cubic root of 161700651 is about 544.8001972190.

The spelling of 161700651 in words is "one hundred sixty-one million, seven hundred thousand, six hundred fifty-one".