61257555308064 has 96 divisors (see below), whose sum is σ = 161384360546304. Its totient is φ = 20345131572480.

The previous prime is 61257555308063. The next prime is 61257555308129. The reversal of 61257555308064 is 46080355575216.

It is a tau number, because it is divible by the number of its divisors (96).

It is a junction number, because it is equal to n+sod(n) for n = 61257555307995 and 61257555308013.

It is not an unprimeable number, because it can be changed into a prime (61257555308063) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 307197577 + ... + 307396919.

It is an arithmetic number, because the mean of its divisors is an integer number (1681087089024).

Almost surely, 2^{61257555308064} is an apocalyptic number.

It is an amenable number.

61257555308064 is an abundant number, since it is smaller than the sum of its proper divisors (100126805238240).

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

61257555308064 is a wasteful number, since it uses less digits than its factorization.

61257555308064 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 210950 (or 210942 counting only the distinct ones).

The product of its (nonzero) digits is 30240000, while the sum is 57.

The spelling of 61257555308064 in words is "sixty-one trillion, two hundred fifty-seven billion, five hundred fifty-five million, three hundred eight thousand, sixty-four".