61051978800 has 120 divisors (see below), whose sum is σ = 217299859280. Its totient is φ = 16280524800.

The previous prime is 61051978751. The next prime is 61051978811. The reversal of 61051978800 is 887915016.

61051978800 is a `hidden beast` number, since 61 + 0 + 519 + 78 + 8 + 0 + 0 = 666.

61051978800 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a tau number, because it is divible by the number of its divisors (120).

It is a Harshad number since it is a multiple of its sum of digits (45).

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, 2815681 + ... + 2837280.

Almost surely, 2^61051978800 is an apocalyptic number.

61051978800 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

61051978800 is an abundant number, since it is smaller than the sum of its proper divisors (156247880480).

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

61051978800 is a wasteful number, since it uses less digits than its factorization.

61051978800 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5652988 (or 5652971 counting only the distinct ones).

The product of its (nonzero) digits is 120960, while the sum is 45.

The spelling of 61051978800 in words is "sixty-one billion, fifty-one million, nine hundred seventy-eight thousand, eight hundred".