265139637121 has 4 divisors (see below), whose sum is σ = 265208562112. Its totient is φ = 265070712132.

The previous prime is 265139637101. The next prime is 265139637149. The reversal of 265139637121 is 121736931562.

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 265139637121 - 2²¹ = 265137539969 is a prime.

It is a super-2 number, since 2×265139637121² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (265139637101) 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, 34456725 + ... + 34464418.

It is an arithmetic number, because the mean of its divisors is an integer number (66302140528).

Almost surely, 2^265139637121 is an apocalyptic number.

It is an amenable number.

265139637121 is a deficient number, since it is larger than the sum of its proper divisors (68924991).

265139637121 is an equidigital number, since it uses as much as digits as its factorization.

265139637121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 68924990.

The product of its digits is 408240, while the sum is 46.

The spelling of 265139637121 in words is "two hundred sixty-five billion, one hundred thirty-nine million, six hundred thirty-seven thousand, one hundred twenty-one".