81262265007 has 24 divisors (see below), whose sum is σ = 136108701568. Its totient is φ = 42214162320.

The previous prime is 81262264933. The next prime is 81262265017. The reversal of 81262265007 is 70056226218.

It is not a de Polignac number, because 81262265007 - 2¹⁰ = 81262263983 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81262265017) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 15987673 + ... + 15992754.

Almost surely, 2^81262265007 is an apocalyptic number.

81262265007 is a deficient number, since it is larger than the sum of its proper divisors (54846436561).

81262265007 is a wasteful number, since it uses less digits than its factorization.

81262265007 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31980459 (or 31980448 counting only the distinct ones).

The product of its (nonzero) digits is 80640, while the sum is 39.

The spelling of 81262265007 in words is "eighty-one billion, two hundred sixty-two million, two hundred sixty-five thousand, seven".