1557757770666 has 32 divisors (see below), whose sum is σ = 3145676663808. Its totient is φ = 514228959600.

The previous prime is 1557757770659. The next prime is 1557757770683. The reversal of 1557757770666 is 6660777577551.

It is a self number, because there is not a number n which added to its sum of digits gives 1557757770666.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1539441 + ... + 2342091.

It is an arithmetic number, because the mean of its divisors is an integer number (98302395744).

Almost surely, 2^{1557757770666} is an apocalyptic number.

1557757770666 is an abundant number, since it is smaller than the sum of its proper divisors (1587918893142).

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

1557757770666 is a wasteful number, since it uses less digits than its factorization.

1557757770666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 805786.

The product of its (nonzero) digits is 453789000, while the sum is 69.

The spelling of 1557757770666 in words is "one trillion, five hundred fifty-seven billion, seven hundred fifty-seven million, seven hundred seventy thousand, six hundred sixty-six".