1657557393402 has 8 divisors (see below), whose sum is σ = 3315114786816. Its totient is φ = 552519131132.

The previous prime is 1657557393397. The next prime is 1657557393407. The reversal of 1657557393402 is 2043937557561.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (1657557393397) and next prime (1657557393407).

It is a sphenic number, since it is the product of 3 distinct primes.

1657557393402 is an admirable number.

It is not an unprimeable number, because it can be changed into a prime (1657557393407) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 138129782778 + ... + 138129782789.

It is an arithmetic number, because the mean of its divisors is an integer number (414389348352).

Almost surely, 2^{1657557393402} is an apocalyptic number.

1657557393402 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1657557393402 is a wasteful number, since it uses less digits than its factorization.

1657557393402 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 276259565572.

The product of its (nonzero) digits is 23814000, while the sum is 57.

The spelling of 1657557393402 in words is "one trillion, six hundred fifty-seven billion, five hundred fifty-seven million, three hundred ninety-three thousand, four hundred two".