6157120661 has 4 divisors (see below), whose sum is σ = 6157648992. Its totient is φ = 6156592332.

The previous prime is 6157120633. The next prime is 6157120681. The reversal of 6157120661 is 1660217516.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 6157120661 - 2³⁰ = 5083378837 is a prime.

It is a super-2 number, since 2×6157120661² = 75820269668226153842, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6157120681) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 246281 + ... + 270126.

It is an arithmetic number, because the mean of its divisors is an integer number (1539412248).

Almost surely, 2^6157120661 is an apocalyptic number.

It is an amenable number.

6157120661 is a deficient number, since it is larger than the sum of its proper divisors (528331).

6157120661 is a wasteful number, since it uses less digits than its factorization.

6157120661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 528330.

The product of its (nonzero) digits is 15120, while the sum is 35.

The square root of 6157120661 is about 78467.3222494562. The cubic root of 6157120661 is about 1832.8456291225.

The spelling of 6157120661 in words is "six billion, one hundred fifty-seven million, one hundred twenty thousand, six hundred sixty-one".