1557653990465 has 8 divisors (see below), whose sum is σ = 1870446907368. Its totient is φ = 1245281779840.

The previous prime is 1557653990441. The next prime is 1557653990471. The reversal of 1557653990465 is 5640993567551.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 182810974096 + 1374843016369 = 427564^2 + 1172537^2 .

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

It is not a de Polignac number, because 1557653990465 - 2¹⁸ = 1557653728321 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 105168422 + ... + 105183231.

It is an arithmetic number, because the mean of its divisors is an integer number (233805863421).

Almost surely, 2^{1557653990465} is an apocalyptic number.

It is an amenable number.

1557653990465 is a deficient number, since it is larger than the sum of its proper divisors (312792916903).

1557653990465 is a wasteful number, since it uses less digits than its factorization.

1557653990465 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 210353139.

The product of its (nonzero) digits is 153090000, while the sum is 65.

The spelling of 1557653990465 in words is "one trillion, five hundred fifty-seven billion, six hundred fifty-three million, nine hundred ninety thousand, four hundred sixty-five".