61951118138 has 32 divisors (see below), whose sum is σ = 115420609920. Its totient is φ = 24283281600.

The previous prime is 61951118077. The next prime is 61951118143. The reversal of 61951118138 is 83181115916.

61951118138 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1541588 + ... + 1581263.

It is an arithmetic number, because the mean of its divisors is an integer number (3606894060).

Almost surely, 2^61951118138 is an apocalyptic number.

61951118138 is a deficient number, since it is larger than the sum of its proper divisors (53469491782).

61951118138 is a wasteful number, since it uses less digits than its factorization.

61951118138 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3122982.

The product of its digits is 51840, while the sum is 44.

The spelling of 61951118138 in words is "sixty-one billion, nine hundred fifty-one million, one hundred eighteen thousand, one hundred thirty-eight".