61149987907 has 4 divisors (see below), whose sum is σ = 62186428440. Its totient is φ = 60113547376.

The previous prime is 61149987893. The next prime is 61149987919. The reversal of 61149987907 is 70978994116.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 61149987907 - 2⁷ = 61149987779 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (61149987947) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 518220178 + ... + 518220295.

It is an arithmetic number, because the mean of its divisors is an integer number (15546607110).

Almost surely, 2^61149987907 is an apocalyptic number.

61149987907 is a deficient number, since it is larger than the sum of its proper divisors (1036440533).

61149987907 is a wasteful number, since it uses less digits than its factorization.

61149987907 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1036440532.

The product of its (nonzero) digits is 6858432, while the sum is 61.

The spelling of 61149987907 in words is "sixty-one billion, one hundred forty-nine million, nine hundred eighty-seven thousand, nine hundred seven".