681656553515 has 24 divisors (see below), whose sum is σ = 977254129872. Its totient is φ = 454788613440.

The previous prime is 681656553481. The next prime is 681656553533. The reversal of 681656553515 is 515355656186.

It is not a de Polignac number, because 681656553515 - 2²⁶ = 681589444651 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 37589201 + ... + 37607330.

It is an arithmetic number, because the mean of its divisors is an integer number (40718922078).

Almost surely, 2^681656553515 is an apocalyptic number.

681656553515 is a deficient number, since it is larger than the sum of its proper divisors (295597576357).

681656553515 is a wasteful number, since it uses less digits than its factorization.

681656553515 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 75196587 (or 75196580 counting only the distinct ones).

The product of its digits is 16200000, while the sum is 56.

The spelling of 681656553515 in words is "six hundred eighty-one billion, six hundred fifty-six million, five hundred fifty-three thousand, five hundred fifteen".