690937236821 has 16 divisors (see below), whose sum is σ = 777319441920. Its totient is φ = 609365602560.

The previous prime is 690937236817. The next prime is 690937236833. The reversal of 690937236821 is 128632739096.

It is not a de Polignac number, because 690937236821 - 2² = 690937236817 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (690937236881) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1048061 + ... + 1574898.

It is an arithmetic number, because the mean of its divisors is an integer number (48582465120).

Almost surely, 2^690937236821 is an apocalyptic number.

It is an amenable number.

690937236821 is a deficient number, since it is larger than the sum of its proper divisors (86382205099).

690937236821 is a wasteful number, since it uses less digits than its factorization.

690937236821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2623876.

The product of its (nonzero) digits is 5878656, while the sum is 56.

The spelling of 690937236821 in words is "six hundred ninety billion, nine hundred thirty-seven million, two hundred thirty-six thousand, eight hundred twenty-one".