690756595081 has 6 divisors (see below), whose sum is σ = 803533182090. Its totient is φ = 592077081456.

The previous prime is 690756595069. The next prime is 690756595093. The reversal of 690756595081 is 180595657096.

It is an interprime number because it is at equal distance from previous prime (690756595069) and next prime (690756595093).

It can be written as a sum of positive squares in only one way, i.e., 558769705081 + 131986890000 = 747509^2 + 363300^2 .

It is a de Polignac number, because none of the positive numbers 2^k-690756595081 is a prime.

It is a super-2 number, since 2×690756595081² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (690756595981) by changing a digit.

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, 7048536636 + ... + 7048536733.

It is an arithmetic number, because the mean of its divisors is an integer number (133922197015).

Almost surely, 2^690756595081 is an apocalyptic number.

It is an amenable number.

690756595081 is a deficient number, since it is larger than the sum of its proper divisors (112776587009).

690756595081 is a wasteful number, since it uses less digits than its factorization.

690756595081 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14097073383 (or 14097073376 counting only the distinct ones).

The product of its (nonzero) digits is 20412000, while the sum is 61.

The spelling of 690756595081 in words is "six hundred ninety billion, seven hundred fifty-six million, five hundred ninety-five thousand, eighty-one".