690947651477 has 2 divisors, whose sum is σ = 690947651478. Its totient is φ = 690947651476.

The previous prime is 690947651453. The next prime is 690947651521. The reversal of 690947651477 is 774156749096.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 628002361156 + 62945290321 = 792466^2 + 250889^2 .

It is a cyclic number.

It is not a de Polignac number, because 690947651477 - 2¹⁰ = 690947650453 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (690947651377) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 345473825738 + 345473825739.

It is an arithmetic number, because the mean of its divisors is an integer number (345473825739).

Almost surely, 2^690947651477 is an apocalyptic number.

It is an amenable number.

690947651477 is a deficient number, since it is larger than the sum of its proper divisors (1).

690947651477 is an equidigital number, since it uses as much as digits as its factorization.

690947651477 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 80015040, while the sum is 65.

The spelling of 690947651477 in words is "six hundred ninety billion, nine hundred forty-seven million, six hundred fifty-one thousand, four hundred seventy-seven".