81376397154 has 24 divisors (see below), whose sum is σ = 189878260572. Its totient is φ = 25038891360.

The previous prime is 81376397153. The next prime is 81376397173. The reversal of 81376397154 is 45179367318.

It can be written as a sum of positive squares in 2 ways, for example, as 70316719929 + 11059677225 = 265173^2 + 105165^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 81376397154.

It is not an unprimeable number, because it can be changed into a prime (81376397153) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 173880957 + ... + 173881424.

Almost surely, 2^81376397154 is an apocalyptic number.

81376397154 is an abundant number, since it is smaller than the sum of its proper divisors (108501863418).

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

81376397154 is a wasteful number, since it uses less digits than its factorization.

81376397154 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 347762402 (or 347762399 counting only the distinct ones).

The product of its digits is 3810240, while the sum is 54.

The spelling of 81376397154 in words is "eighty-one billion, three hundred seventy-six million, three hundred ninety-seven thousand, one hundred fifty-four".