121163661 has 8 divisors (see below), whose sum is σ = 179501760. Its totient is φ = 80775756.

The previous prime is 121163633. The next prime is 121163683. The reversal of 121163661 is 166361121.

121163661 is a `hidden beast` number, since 1 + 21 + 1 + 636 + 6 + 1 = 666.

It is not a de Polignac number, because 121163661 - 2⁷ = 121163533 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27), and also a Moran number because the ratio is a prime number: 4487543 = 121163661 / (1 + 2 + 1 + 1 + 6 + 3 + 6 + 6 + 1).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121163611) 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, 2243745 + ... + 2243798.

It is an arithmetic number, because the mean of its divisors is an integer number (22437720).

Almost surely, 2^121163661 is an apocalyptic number.

It is an amenable number.

121163661 is a deficient number, since it is larger than the sum of its proper divisors (58338099).

121163661 is an equidigital number, since it uses as much as digits as its factorization.

121163661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4487552 (or 4487546 counting only the distinct ones).

The product of its digits is 1296, while the sum is 27.

The square root of 121163661 is about 11007.4366225748. The cubic root of 121163661 is about 494.8316415510.

The spelling of 121163661 in words is "one hundred twenty-one million, one hundred sixty-three thousand, six hundred sixty-one".