81538153052 has 24 divisors (see below), whose sum is σ = 144449768736. Its totient is φ = 40268464128.

The previous prime is 81538152989. The next prime is 81538153069. The reversal of 81538153052 is 25035183518.

It is a congruent number.

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, 13733 + ... + 404060.

It is an arithmetic number, because the mean of its divisors is an integer number (6018740364).

Almost surely, 2^81538153052 is an apocalyptic number.

It is an amenable number.

81538153052 is a deficient number, since it is larger than the sum of its proper divisors (62911615684).

81538153052 is a wasteful number, since it uses less digits than its factorization.

81538153052 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 418397 (or 418395 counting only the distinct ones).

The product of its (nonzero) digits is 144000, while the sum is 41.

The spelling of 81538153052 in words is "eighty-one billion, five hundred thirty-eight million, one hundred fifty-three thousand, fifty-two".