690819677921 has 4 divisors (see below), whose sum is σ = 696259203072. Its totient is φ = 685380152772.

The previous prime is 690819677869. The next prime is 690819677941. The reversal of 690819677921 is 129776918096.

690819677921 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 690819677921 - 2⁶ = 690819677857 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (690819677941) 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, 2719762385 + ... + 2719762638.

It is an arithmetic number, because the mean of its divisors is an integer number (174064800768).

Almost surely, 2^690819677921 is an apocalyptic number.

It is an amenable number.

690819677921 is a deficient number, since it is larger than the sum of its proper divisors (5439525151).

690819677921 is a wasteful number, since it uses less digits than its factorization.

690819677921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5439525150.

The product of its (nonzero) digits is 20575296, while the sum is 65.

The spelling of 690819677921 in words is "six hundred ninety billion, eight hundred nineteen million, six hundred seventy-seven thousand, nine hundred twenty-one".