687053083217021 has 8 divisors (see below), whose sum is σ = 693357006423840. Its totient is φ = 680749172445168.

The previous prime is 687053083216991. The next prime is 687053083217069. The reversal of 687053083217021 is 120712380350786.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 687053083217021 - 2³⁸ = 686778205310077 is a prime.

It is a super-2 number, since 2×687053083217021² (a number of 30 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (687053083214021) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 136554950 + ... + 141496856.

It is an arithmetic number, because the mean of its divisors is an integer number (86669625802980).

Almost surely, 2^{687053083217021} is an apocalyptic number.

It is an amenable number.

687053083217021 is a deficient number, since it is larger than the sum of its proper divisors (6303923206819).

687053083217021 is a wasteful number, since it uses less digits than its factorization.

687053083217021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6217483.

The product of its (nonzero) digits is 3386880, while the sum is 53.

The spelling of 687053083217021 in words is "six hundred eighty-seven trillion, fifty-three billion, eighty-three million, two hundred seventeen thousand, twenty-one".