61016557440 has 128 divisors (see below), whose sum is σ = 204726729600. Its totient is φ = 15414700032.

The previous prime is 61016557363. The next prime is 61016557489. The reversal of 61016557440 is 4475561016.

61016557440 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 (128).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 799822 + ... + 872781.

It is an arithmetic number, because the mean of its divisors is an integer number (1599427575).

Almost surely, 2^61016557440 is an apocalyptic number.

61016557440 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

61016557440 is an abundant number, since it is smaller than the sum of its proper divisors (143710172160).

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

61016557440 is a wasteful number, since it uses less digits than its factorization.

61016557440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1672644 (or 1672632 counting only the distinct ones).

The product of its (nonzero) digits is 100800, while the sum is 39.

The spelling of 61016557440 in words is "sixty-one billion, sixteen million, five hundred fifty-seven thousand, four hundred forty".