61273455920 has 40 divisors (see below), whose sum is σ = 142915989696. Its totient is φ = 24431067648.

The previous prime is 61273455833. The next prime is 61273455937. The reversal of 61273455920 is 2955437216.

It is a tau number, because it is divible by the number of its divisors (40).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1198472 + ... + 1248551.

Almost surely, 2^61273455920 is an apocalyptic number.

It is an amenable number.

61273455920 is an abundant number, since it is smaller than the sum of its proper divisors (81642533776).

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

61273455920 is a wasteful number, since it uses less digits than its factorization.

61273455920 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2447349 (or 2447343 counting only the distinct ones).

The product of its (nonzero) digits is 453600, while the sum is 44.

The spelling of 61273455920 in words is "sixty-one billion, two hundred seventy-three million, four hundred fifty-five thousand, nine hundred twenty".