61690994831387 has 2 divisors, whose sum is σ = 61690994831388. Its totient is φ = 61690994831386.

The previous prime is 61690994831383. The next prime is 61690994831407. The reversal of 61690994831387 is 78313849909616.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 61690994831387 - 2² = 61690994831383 is a prime.

It is not a weakly prime, because it can be changed into another prime (61690994831383) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30845497415693 + 30845497415694.

It is an arithmetic number, because the mean of its divisors is an integer number (30845497415694).

Almost surely, 2^{61690994831387} is an apocalyptic number.

61690994831387 is a deficient number, since it is larger than the sum of its proper divisors (1).

61690994831387 is an equidigital number, since it uses as much as digits as its factorization.

61690994831387 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 423263232, while the sum is 74.

The spelling of 61690994831387 in words is "sixty-one trillion, six hundred ninety billion, nine hundred ninety-four million, eight hundred thirty-one thousand, three hundred eighty-seven".