661376607 has 8 divisors (see below), whose sum is σ = 896782080. Its totient is φ = 433444440.

The previous prime is 661376549. The next prime is 661376609. The reversal of 661376607 is 706673166.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 661376607 - 2⁷ = 661376479 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (661376609) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1868119 + ... + 1868472.

It is an arithmetic number, because the mean of its divisors is an integer number (112097760).

Almost surely, 2^661376607 is an apocalyptic number.

661376607 is a deficient number, since it is larger than the sum of its proper divisors (235405473).

661376607 is a wasteful number, since it uses less digits than its factorization.

661376607 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3736653.

The product of its (nonzero) digits is 190512, while the sum is 42.

The square root of 661376607 is about 25717.2433787138. The cubic root of 661376607 is about 871.2636795304.

The spelling of 661376607 in words is "six hundred sixty-one million, three hundred seventy-six thousand, six hundred seven".