61781012254 has 16 divisors (see below), whose sum is σ = 100247640192. Its totient is φ = 28386443808.

The previous prime is 61781012243. The next prime is 61781012297. The reversal of 61781012254 is 45221018716.

It is a congruent number.

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, 5321989 + ... + 5333584.

It is an arithmetic number, because the mean of its divisors is an integer number (6265477512).

Almost surely, 2^61781012254 is an apocalyptic number.

61781012254 is a deficient number, since it is larger than the sum of its proper divisors (38466627938).

61781012254 is a wasteful number, since it uses less digits than its factorization.

61781012254 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10655811.

The product of its (nonzero) digits is 26880, while the sum is 37.

The spelling of 61781012254 in words is "sixty-one billion, seven hundred eighty-one million, twelve thousand, two hundred fifty-four".