61983638915 has 64 divisors (see below), whose sum is σ = 86470986240. Its totient is φ = 42179927040.

The previous prime is 61983638903. The next prime is 61983638921. The reversal of 61983638915 is 51983638916.

It is not a de Polignac number, because 61983638915 - 2²⁰ = 61982590339 is a prime.

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 63 ways as a sum of consecutive naturals, for example, 51098849 + ... + 51100061.

It is an arithmetic number, because the mean of its divisors is an integer number (1351109160).

Almost surely, 2^61983638915 is an apocalyptic number.

61983638915 is a deficient number, since it is larger than the sum of its proper divisors (24487347325).

61983638915 is a wasteful number, since it uses less digits than its factorization.

61983638915 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1812.

The product of its digits is 8398080, while the sum is 59.

Subtracting from 61983638915 its reverse (51983638916), we obtain a palindrome (9999999999).

The spelling of 61983638915 in words is "sixty-one billion, nine hundred eighty-three million, six hundred thirty-eight thousand, nine hundred fifteen".