61985253654 has 24 divisors (see below), whose sum is σ = 134320920552. Its totient is φ = 20658745440.

The previous prime is 61985253619. The next prime is 61985253691. The reversal of 61985253654 is 45635258916.

61985253654 is a `hidden beast` number, since 6 + 1 + 9 + 8 + 52 + 536 + 54 = 666.

It is a self number, because there is not a number n which added to its sum of digits gives 61985253654.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 121519 + ... + 372474.

It is an arithmetic number, because the mean of its divisors is an integer number (5596705023).

Almost surely, 2^61985253654 is an apocalyptic number.

61985253654 is an abundant number, since it is smaller than the sum of its proper divisors (72335666898).

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

61985253654 is a wasteful number, since it uses less digits than its factorization.

61985253654 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 500972 (or 500969 counting only the distinct ones).

The product of its digits is 7776000, while the sum is 54.

The spelling of 61985253654 in words is "sixty-one billion, nine hundred eighty-five million, two hundred fifty-three thousand, six hundred fifty-four".