615139026457 has 2 divisors, whose sum is σ = 615139026458. Its totient is φ = 615139026456.

The previous prime is 615139026451. The next prime is 615139026473. The reversal of 615139026457 is 754620931516.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 598118171161 + 17020855296 = 773381^2 + 130464^2 .

It is a cyclic number.

It is not a de Polignac number, because 615139026457 - 2²⁷ = 615004808729 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 615139026457.

It is not a weakly prime, because it can be changed into another prime (615139026451) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 307569513228 + 307569513229.

It is an arithmetic number, because the mean of its divisors is an integer number (307569513229).

Almost surely, 2^615139026457 is an apocalyptic number.

It is an amenable number.

615139026457 is a deficient number, since it is larger than the sum of its proper divisors (1).

615139026457 is an equidigital number, since it uses as much as digits as its factorization.

615139026457 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1360800, while the sum is 49.

The spelling of 615139026457 in words is "six hundred fifteen billion, one hundred thirty-nine million, twenty-six thousand, four hundred fifty-seven".