61687964434 has 16 divisors (see below), whose sum is σ = 95181140376. Its totient is φ = 29963520000.

The previous prime is 61687964383. The next prime is 61687964441. The reversal of 61687964434 is 43446978616.

61687964434 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 61580904025 + 107060409 = 248155^2 + 10347^2 .

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, 602817 + ... + 697684.

Almost surely, 2^61687964434 is an apocalyptic number.

61687964434 is a deficient number, since it is larger than the sum of its proper divisors (33493175942).

61687964434 is a wasteful number, since it uses less digits than its factorization.

61687964434 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1301181.

The product of its digits is 20901888, while the sum is 58.

The spelling of 61687964434 in words is "sixty-one billion, six hundred eighty-seven million, nine hundred sixty-four thousand, four hundred thirty-four".