690891647757 has 32 divisors (see below), whose sum is σ = 1001498910720. Its totient is φ = 422046106560.

The previous prime is 690891647753. The next prime is 690891647783. The reversal of 690891647757 is 757746198096.

It is a happy number.

690891647757 is digitally balanced in base 2 and base 4, because in such bases it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 690891647757 - 2² = 690891647753 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 690891647691 and 690891647700.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (690891647753) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 3157803 + ... + 3369495.

It is an arithmetic number, because the mean of its divisors is an integer number (31296840960).

Almost surely, 2^690891647757 is an apocalyptic number.

It is an amenable number.

690891647757 is a deficient number, since it is larger than the sum of its proper divisors (310607262963).

690891647757 is a wasteful number, since it uses less digits than its factorization.

690891647757 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 213593.

The product of its (nonzero) digits is 160030080, while the sum is 69.

The spelling of 690891647757 in words is "six hundred ninety billion, eight hundred ninety-one million, six hundred forty-seven thousand, seven hundred fifty-seven".