81450153015 has 64 divisors (see below), whose sum is σ = 166255828992. Its totient is φ = 33062198400.

The previous prime is 81450152999. The next prime is 81450153047. The reversal of 81450153015 is 51035105418.

It is a happy number.

It is not a de Polignac number, because 81450153015 - 2⁴ = 81450152999 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 770331 + ... + 869660.

It is an arithmetic number, because the mean of its divisors is an integer number (2597747328).

Almost surely, 2^81450153015 is an apocalyptic number.

81450153015 is an abundant number, since it is smaller than the sum of its proper divisors (84805675977).

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

81450153015 is a wasteful number, since it uses less digits than its factorization.

81450153015 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1640060.

The product of its (nonzero) digits is 12000, while the sum is 33.

The spelling of 81450153015 in words is "eighty-one billion, four hundred fifty million, one hundred fifty-three thousand, fifteen".