265716403421 has 16 divisors (see below), whose sum is σ = 309437356800. Its totient is φ = 223476392448.

The previous prime is 265716403387. The next prime is 265716403427. The reversal of 265716403421 is 124304617562.

It is a cyclic number.

It is not a de Polignac number, because 265716403421 - 2⁶ = 265716403357 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 (265716403427) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1611956 + ... + 1769133.

It is an arithmetic number, because the mean of its divisors is an integer number (19339834800).

Almost surely, 2^265716403421 is an apocalyptic number.

It is an amenable number.

265716403421 is a deficient number, since it is larger than the sum of its proper divisors (43720953379).

265716403421 is a wasteful number, since it uses less digits than its factorization.

265716403421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3381308.

The product of its (nonzero) digits is 241920, while the sum is 41.

The spelling of 265716403421 in words is "two hundred sixty-five billion, seven hundred sixteen million, four hundred three thousand, four hundred twenty-one".