39545642690 has 16 divisors (see below), whose sum is σ = 71593617528. Its totient is φ = 15726821376.

The previous prime is 39545642677. The next prime is 39545642701. The reversal of 39545642690 is 9624654593.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 36776883529 + 2768759161 = 191773^2 + 52619^2 .

It is a super-2 number, since 2×39545642690² (a number of 22 digits) contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11427647 + ... + 11431106.

Almost surely, 2^39545642690 is an apocalyptic number.

39545642690 is a deficient number, since it is larger than the sum of its proper divisors (32047974838).

39545642690 is a wasteful number, since it uses less digits than its factorization.

39545642690 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22858933.

The product of its (nonzero) digits is 6998400, while the sum is 53.

The spelling of 39545642690 in words is "thirty-nine billion, five hundred forty-five million, six hundred forty-two thousand, six hundred ninety".