6156957981 has 8 divisors (see below), whose sum is σ = 8213392000. Its totient is φ = 4102581312.

The previous prime is 6156957959. The next prime is 6156957991. The reversal of 6156957981 is 1897596516.

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

It is not a de Polignac number, because 6156957981 - 2⁷ = 6156957853 is a prime.

It is a super-2 number, since 2×6156957981² = 75816263159599192722, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6156957931) 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, 507340 + ... + 519333.

It is an arithmetic number, because the mean of its divisors is an integer number (1026674000).

Almost surely, 2^6156957981 is an apocalyptic number.

It is an amenable number.

6156957981 is a deficient number, since it is larger than the sum of its proper divisors (2056434019).

6156957981 is a wasteful number, since it uses less digits than its factorization.

6156957981 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1028675.

The product of its digits is 4082400, while the sum is 57.

The square root of 6156957981 is about 78466.2856327480. The cubic root of 6156957981 is about 1832.8294868395.

It can be divided in two parts, 615 and 6957981, that added together give a palindrome (6958596).

The spelling of 6156957981 in words is "six billion, one hundred fifty-six million, nine hundred fifty-seven thousand, nine hundred eighty-one".