73400647918457 has 2 divisors, whose sum is σ = 73400647918458. Its totient is φ = 73400647918456.

The previous prime is 73400647918391. The next prime is 73400647918487. The reversal of 73400647918457 is 75481974600437.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 56291347595536 + 17109300322921 = 7502756^2 + 4136339^2 .

It is a cyclic number.

It is not a de Polignac number, because 73400647918457 - 2²² = 73400643724153 is a prime.

It is a super-2 number, since 2×73400647918457² (a number of 29 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 73400647918393 and 73400647918402.

It is not a weakly prime, because it can be changed into another prime (73400647918487) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 36700323959228 + 36700323959229.

It is an arithmetic number, because the mean of its divisors is an integer number (36700323959229).

Almost surely, 2^{73400647918457} is an apocalyptic number.

It is an amenable number.

73400647918457 is a deficient number, since it is larger than the sum of its proper divisors (1).

73400647918457 is an equidigital number, since it uses as much as digits as its factorization.

73400647918457 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 142248960, while the sum is 65.

The spelling of 73400647918457 in words is "seventy-three trillion, four hundred billion, six hundred forty-seven million, nine hundred eighteen thousand, four hundred fifty-seven".