7957136257081 has 4 divisors (see below), whose sum is σ = 8680512280464. Its totient is φ = 7233760233700.

The previous prime is 7957136257061. The next prime is 7957136257099. The reversal of 7957136257081 is 1807526317597.

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 de Polignac number, because none of the positive numbers 2^k-7957136257081 is a prime.

It is a super-3 number, since 3×7957136257081³ (a number of 40 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (7957136257051) 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, 361688011675 + ... + 361688011696.

It is an arithmetic number, because the mean of its divisors is an integer number (2170128070116).

Almost surely, 2^{7957136257081} is an apocalyptic number.

It is an amenable number.

7957136257081 is a deficient number, since it is larger than the sum of its proper divisors (723376023383).

7957136257081 is a wasteful number, since it uses less digits than its factorization.

7957136257081 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 723376023382.

The product of its (nonzero) digits is 22226400, while the sum is 61.

The spelling of 7957136257081 in words is "seven trillion, nine hundred fifty-seven billion, one hundred thirty-six million, two hundred fifty-seven thousand, eighty-one".