687970713601 has 4 divisors (see below), whose sum is σ = 688452150100. Its totient is φ = 687489277104.

The previous prime is 687970713593. The next prime is 687970713637. The reversal of 687970713601 is 106317079786.

It is a Cunningham number, because it is equal to 829440²+1.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 46371315600 + 641599398001 = 215340^2 + 800999^2 .

It is a cyclic number.

It is not a de Polignac number, because 687970713601 - 2³ = 687970713593 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (687170713601) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 240716106 + ... + 240718963.

It is an arithmetic number, because the mean of its divisors is an integer number (172113037525).

It is a Proth number, since it is equal to 164025 ⋅ 2²² + 1 and 164025 < 2²².

Almost surely, 2^687970713601 is an apocalyptic number.

It is an amenable number.

687970713601 is a deficient number, since it is larger than the sum of its proper divisors (481436499).

687970713601 is a wasteful number, since it uses less digits than its factorization.

687970713601 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 481436498.

The product of its (nonzero) digits is 2667168, while the sum is 55.

The spelling of 687970713601 in words is "six hundred eighty-seven billion, nine hundred seventy million, seven hundred thirteen thousand, six hundred one".