61555438312 has 32 divisors (see below), whose sum is σ = 122232654720. Its totient is φ = 28960864000.

The previous prime is 61555438297. The next prime is 61555438327. The reversal of 61555438312 is 21383455516.

It is an interprime number because it is at equal distance from previous prime (61555438297) and next prime (61555438327).

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 598503 + ... + 693769.

It is an arithmetic number, because the mean of its divisors is an integer number (3819770460).

Almost surely, 2^61555438312 is an apocalyptic number.

It is an amenable number.

61555438312 is a deficient number, since it is larger than the sum of its proper divisors (60677216408).

61555438312 is a wasteful number, since it uses less digits than its factorization.

61555438312 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 100041 (or 100037 counting only the distinct ones).

The product of its digits is 432000, while the sum is 43.

The spelling of 61555438312 in words is "sixty-one billion, five hundred fifty-five million, four hundred thirty-eight thousand, three hundred twelve".