61256405553 has 32 divisors (see below), whose sum is σ = 95540831232. Its totient is φ = 34179969600.

The previous prime is 61256405543. The next prime is 61256405579. The reversal of 61256405553 is 35550465216.

It is not a de Polignac number, because 61256405553 - 2⁶ = 61256405489 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (61256405513) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 4228743 + ... + 4243203.

It is an arithmetic number, because the mean of its divisors is an integer number (2985650976).

Almost surely, 2^61256405553 is an apocalyptic number.

It is an amenable number.

61256405553 is a deficient number, since it is larger than the sum of its proper divisors (34284425679).

61256405553 is a wasteful number, since it uses less digits than its factorization.

61256405553 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19205.

The product of its (nonzero) digits is 540000, while the sum is 42.

The spelling of 61256405553 in words is "sixty-one billion, two hundred fifty-six million, four hundred five thousand, five hundred fifty-three".