81154385570 has 32 divisors (see below), whose sum is σ = 147653203968. Its totient is φ = 32113162368.

The previous prime is 81154385563. The next prime is 81154385593. The reversal of 81154385570 is 7558345118.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 348614 + ... + 532766.

It is an arithmetic number, because the mean of its divisors is an integer number (4614162624).

Almost surely, 2^81154385570 is an apocalyptic number.

81154385570 is a deficient number, since it is larger than the sum of its proper divisors (66498818398).

81154385570 is a wasteful number, since it uses less digits than its factorization.

81154385570 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 184634.

The product of its (nonzero) digits is 672000, while the sum is 47.

The spelling of 81154385570 in words is "eighty-one billion, one hundred fifty-four million, three hundred eighty-five thousand, five hundred seventy".