64590691537 has 2 divisors, whose sum is σ = 64590691538. Its totient is φ = 64590691536.

The previous prime is 64590691507. The next prime is 64590691547. The reversal of 64590691537 is 73519609546.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 60570624321 + 4020067216 = 246111^2 + 63404^2 .

It is a cyclic number.

It is not a de Polignac number, because 64590691537 - 2¹¹ = 64590689489 is a prime.

It is not a weakly prime, because it can be changed into another prime (64590691507) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32295345768 + 32295345769.

It is an arithmetic number, because the mean of its divisors is an integer number (32295345769).

Almost surely, 2^64590691537 is an apocalyptic number.

It is an amenable number.

64590691537 is a deficient number, since it is larger than the sum of its proper divisors (1).

64590691537 is an equidigital number, since it uses as much as digits as its factorization.

64590691537 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 6123600, while the sum is 55.

The spelling of 64590691537 in words is "sixty-four billion, five hundred ninety million, six hundred ninety-one thousand, five hundred thirty-seven".