61355091492864 has 1632 divisors, whose sum is σ = 212419954008000. Its totient is φ = 17648742039552.

The previous prime is 61355091492787. The next prime is 61355091492943. The reversal of 61355091492864 is 46829419055316.

61355091492864 is a `hidden beast` number, since 6 + 1 + 3 + 5 + 50 + 91 + 492 + 8 + 6 + 4 = 666.

It is a tau number, because it is divible by the number of its divisors (1632).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 411779137462 + ... + 411779137610.

Almost surely, 2^{61355091492864} is an apocalyptic number.

61355091492864 is a gapful number since it is divisible by the number (64) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 61355091492864, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (106209977004000).

61355091492864 is an abundant number, since it is smaller than the sum of its proper divisors (151064862515136).

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

61355091492864 is an frugal number, since it uses more digits than its factorization.

61355091492864 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 245 (or 184 counting only the distinct ones).

The product of its (nonzero) digits is 55987200, while the sum is 63.

The spelling of 61355091492864 in words is "sixty-one trillion, three hundred fifty-five billion, ninety-one million, four hundred ninety-two thousand, eight hundred sixty-four".