690844767425 has 6 divisors (see below), whose sum is σ = 856647511638. Its totient is φ = 552675813920.

The previous prime is 690844767409. The next prime is 690844767479. The reversal of 690844767425 is 524767448096.

It is a happy number.

It can be written as a sum of positive squares in 3 ways, for example, as 107924733361 + 582920034064 = 328519^2 + 763492^2 .

It is not a de Polignac number, because 690844767425 - 2⁴ = 690844767409 is a prime.

It is a super-2 number, since 2×690844767425² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 13816895324 + ... + 13816895373.

It is an arithmetic number, because the mean of its divisors is an integer number (142774585273).

Almost surely, 2^690844767425 is an apocalyptic number.

It is an amenable number.

690844767425 is a deficient number, since it is larger than the sum of its proper divisors (165802744213).

690844767425 is a wasteful number, since it uses less digits than its factorization.

690844767425 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27633790707 (or 27633790702 counting only the distinct ones).

The product of its (nonzero) digits is 81285120, while the sum is 62.

The spelling of 690844767425 in words is "six hundred ninety billion, eight hundred forty-four million, seven hundred sixty-seven thousand, four hundred twenty-five".