6157566991 has 8 divisors (see below), whose sum is σ = 6542033904. Its totient is φ = 5775573120.

The previous prime is 6157566979. The next prime is 6157567027. The reversal of 6157566991 is 1996657516.

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

It is a cyclic number.

It is not a de Polignac number, because 6157566991 - 2⁹ = 6157566479 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6157566931) 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, 613125 + ... + 623086.

It is an arithmetic number, because the mean of its divisors is an integer number (817754238).

Almost surely, 2^6157566991 is an apocalyptic number.

6157566991 is a deficient number, since it is larger than the sum of its proper divisors (384466913).

6157566991 is a wasteful number, since it uses less digits than its factorization.

6157566991 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1236521.

The product of its digits is 3061800, while the sum is 55.

The square root of 6157566991 is about 78470.1662480716. The cubic root of 6157566991 is about 1832.8899157444.

The spelling of 6157566991 in words is "six billion, one hundred fifty-seven million, five hundred sixty-six thousand, nine hundred ninety-one".