1657557393407 has 2 divisors, whose sum is σ = 1657557393408. Its totient is φ = 1657557393406.

The previous prime is 1657557393397. The next prime is 1657557393419. The reversal of 1657557393407 is 7043937557561.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1657557393407 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1657557393407.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1657557393487) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 828778696703 + 828778696704.

It is an arithmetic number, because the mean of its divisors is an integer number (828778696704).

Almost surely, 2^{1657557393407} is an apocalyptic number.

1657557393407 is a deficient number, since it is larger than the sum of its proper divisors (1).

1657557393407 is an equidigital number, since it uses as much as digits as its factorization.

1657557393407 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 83349000, while the sum is 62.

The spelling of 1657557393407 in words is "one trillion, six hundred fifty-seven billion, five hundred fifty-seven million, three hundred ninety-three thousand, four hundred seven".