265265126778 has 16 divisors (see below), whose sum is σ = 558452898720. Its totient is φ = 83767934736.

The previous prime is 265265126761. The next prime is 265265126807. The reversal of 265265126778 is 877621562562.

It is a super-2 number, since 2×265265126778² (a number of 24 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (57).

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1163443425 + ... + 1163443652.

It is an arithmetic number, because the mean of its divisors is an integer number (34903306170).

Almost surely, 2^265265126778 is an apocalyptic number.

265265126778 is an abundant number, since it is smaller than the sum of its proper divisors (293187771942).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

265265126778 is a wasteful number, since it uses less digits than its factorization.

265265126778 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2326887101.

The product of its digits is 16934400, while the sum is 57.

The spelling of 265265126778 in words is "two hundred sixty-five billion, two hundred sixty-five million, one hundred twenty-six thousand, seven hundred seventy-eight".