61397958918 has 32 divisors (see below), whose sum is σ = 129335437440. Its totient is φ = 19377342720.

The previous prime is 61397958901. The next prime is 61397959003. The reversal of 61397958918 is 81985979316.

It is a congruent number.

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, 34773 + ... + 352143.

It is an arithmetic number, because the mean of its divisors is an integer number (4041732420).

Almost surely, 2^61397958918 is an apocalyptic number.

61397958918 is an abundant number, since it is smaller than the sum of its proper divisors (67937478522).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

61397958918 is a wasteful number, since it uses less digits than its factorization.

61397958918 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 319092.

The product of its digits is 29393280, while the sum is 66.

The spelling of 61397958918 in words is "sixty-one billion, three hundred ninety-seven million, nine hundred fifty-eight thousand, nine hundred eighteen".