81507825662 has 16 divisors (see below), whose sum is σ = 126495650160. Its totient is φ = 39343008768.

The previous prime is 81507825649. The next prime is 81507825667. The reversal of 81507825662 is 26652870518.

It is a self number, because there is not a number n which added to its sum of digits gives 81507825662.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81507825667) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 326933 + ... + 519519.

It is an arithmetic number, because the mean of its divisors is an integer number (7905978135).

Almost surely, 2^81507825662 is an apocalyptic number.

81507825662 is a deficient number, since it is larger than the sum of its proper divisors (44987824498).

81507825662 is a wasteful number, since it uses less digits than its factorization.

81507825662 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 199915.

The product of its (nonzero) digits is 1612800, while the sum is 50.

The spelling of 81507825662 in words is "eighty-one billion, five hundred seven million, eight hundred twenty-five thousand, six hundred sixty-two".