61507562855840 has 24 divisors (see below), whose sum is σ = 145311617247300. Its totient is φ = 24603025142272.

The previous prime is 61507562855839. The next prime is 61507562855863. The reversal of 61507562855840 is 4855826570516.

It can be written as a sum of positive squares in 2 ways, for example, as 61429290483856 + 78272371984 = 7837684^2 + 279772^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 192211133765 + ... + 192211134084.

Almost surely, 2^{61507562855840} is an apocalyptic number.

It is an amenable number.

61507562855840 is an abundant number, since it is smaller than the sum of its proper divisors (83804054391460).

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

61507562855840 is a wasteful number, since it uses less digits than its factorization.

61507562855840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 384422267864 (or 384422267856 counting only the distinct ones).

The product of its (nonzero) digits is 80640000, while the sum is 62.

The spelling of 61507562855840 in words is "sixty-one trillion, five hundred seven billion, five hundred sixty-two million, eight hundred fifty-five thousand, eight hundred forty".