61520436653240 has 32 divisors (see below), whose sum is σ = 138423516971760. Its totient is φ = 24607724083200.

The previous prime is 61520436653227. The next prime is 61520436653257. The reversal of 61520436653240 is 4235663402516.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11864366 + ... + 16242045.

Almost surely, 2^{61520436653240} is an apocalyptic number.

It is an amenable number.

61520436653240 is an abundant number, since it is smaller than the sum of its proper divisors (76903080318520).

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

61520436653240 is a wasteful number, since it uses less digits than its factorization.

61520436653240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28161143 (or 28161139 counting only the distinct ones).

The product of its (nonzero) digits is 3110400, while the sum is 47.

The spelling of 61520436653240 in words is "sixty-one trillion, five hundred twenty billion, four hundred thirty-six million, six hundred fifty-three thousand, two hundred forty".