61780751424 has 168 divisors, whose sum is σ = 213032888640. Its totient is φ = 16722588672.

The previous prime is 61780751407. The next prime is 61780751441. The reversal of 61780751424 is 42415708716.

61780751424 is a `hidden beast` number, since 6 + 178 + 0 + 7 + 51 + 424 = 666.

It is an interprime number because it is at equal distance from previous prime (61780751407) and next prime (61780751441).

It is a tau number, because it is divible by the number of its divisors (168).

It is a super-2 number, since 2×61780751424² (a number of 22 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 61780751424.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 326619 + ... + 479834.

Almost surely, 2^61780751424 is an apocalyptic number.

61780751424 is a gapful number since it is divisible by the number (64) formed by its first and last digit.

It is an amenable number.

61780751424 is an abundant number, since it is smaller than the sum of its proper divisors (151252137216).

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

61780751424 is a wasteful number, since it uses less digits than its factorization.

61780751424 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 806497 (or 806484 counting only the distinct ones).

The product of its (nonzero) digits is 376320, while the sum is 45.

The spelling of 61780751424 in words is "sixty-one billion, seven hundred eighty million, seven hundred fifty-one thousand, four hundred twenty-four".