61687681002520 has 64 divisors (see below), whose sum is σ = 143669532751200. Its totient is φ = 23809915422720.

The previous prime is 61687681002509. The next prime is 61687681002533. The reversal of 61687681002520 is 2520018678616.

It is a happy number.

It is a super-3 number, since 3×61687681002520³ (a number of 42 digits) contains 333 as substring.

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, 14016801 + ... + 17884240.

Almost surely, 2^{61687681002520} is an apocalyptic number.

It is an amenable number.

61687681002520 is an abundant number, since it is smaller than the sum of its proper divisors (81981851748680).

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

61687681002520 is a wasteful number, since it uses less digits than its factorization.

61687681002520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31902748 (or 31902744 counting only the distinct ones).

The product of its (nonzero) digits is 1935360, while the sum is 52.

The spelling of 61687681002520 in words is "sixty-one trillion, six hundred eighty-seven billion, six hundred eighty-one million, two thousand, five hundred twenty".