81418492730 has 16 divisors (see below), whose sum is σ = 146556698760. Its totient is φ = 32566638912.

The previous prime is 81418492681. The next prime is 81418492801. The reversal of 81418492730 is 3729481418.

It can be written as a sum of positive squares in 4 ways, for example, as 74915521849 + 6502970881 = 273707^2 + 80641^2 .

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, 596012 + ... + 719768.

Almost surely, 2^81418492730 is an apocalyptic number.

81418492730 is a deficient number, since it is larger than the sum of its proper divisors (65138206030).

81418492730 is a wasteful number, since it uses less digits than its factorization.

81418492730 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 189553.

The product of its (nonzero) digits is 387072, while the sum is 47.

The spelling of 81418492730 in words is "eighty-one billion, four hundred eighteen million, four hundred ninety-two thousand, seven hundred thirty".