61897855783680 has 432 divisors, whose sum is σ = 252649752735744. Its totient is φ = 13691691048960.

The previous prime is 61897855783613. The next prime is 61897855783681. The reversal of 61897855783680 is 8638755879816.

61897855783680 is a `hidden beast` number, since 6 + 1 + 8 + 9 + 7 + 8 + 5 + 578 + 36 + 8 + 0 = 666.

It is a self number, because there is not a number n which added to its sum of digits gives 61897855783680.

It is not an unprimeable number, because it can be changed into a prime (61897855783681) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 9880524 + ... + 14880203.

It is an arithmetic number, because the mean of its divisors is an integer number (584837390592).

Almost surely, 2^{61897855783680} is an apocalyptic number.

61897855783680 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

61897855783680 is an abundant number, since it is smaller than the sum of its proper divisors (190751896952064).

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

61897855783680 is a wasteful number, since it uses less digits than its factorization.

61897855783680 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24760792 (or 24760775 counting only the distinct ones).

The product of its (nonzero) digits is 4877107200, while the sum is 81.

The spelling of 61897855783680 in words is "sixty-one trillion, eight hundred ninety-seven billion, eight hundred fifty-five million, seven hundred eighty-three thousand, six hundred eighty".