61767400387 has 16 divisors (see below), whose sum is σ = 77339238912. Its totient is φ = 47923859520.

The previous prime is 61767400379. The next prime is 61767400489. The reversal of 61767400387 is 78300476716.

It is a cyclic number.

It is not a de Polignac number, because 61767400387 - 2³ = 61767400379 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 61767400387.

It is not an unprimeable number, because it can be changed into a prime (61767400307) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1703463 + ... + 1739344.

It is an arithmetic number, because the mean of its divisors is an integer number (4833702432).

Almost surely, 2^61767400387 is an apocalyptic number.

61767400387 is a deficient number, since it is larger than the sum of its proper divisors (15571838525).

61767400387 is a wasteful number, since it uses less digits than its factorization.

61767400387 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3443058.

The product of its (nonzero) digits is 1185408, while the sum is 49.

The spelling of 61767400387 in words is "sixty-one billion, seven hundred sixty-seven million, four hundred thousand, three hundred eighty-seven".