1577867970442 has 4 divisors (see below), whose sum is σ = 2366801955666. Its totient is φ = 788933985220.

The previous prime is 1577867970433. The next prime is 1577867970463. The reversal of 1577867970442 is 2440797687751.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 1431155223481 + 146712746961 = 1196309^2 + 383031^2 .

It is a Smith number, since the sum of its digits (67) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 394466992609 + ... + 394466992612.

Almost surely, 2^{1577867970442} is an apocalyptic number.

1577867970442 is a deficient number, since it is larger than the sum of its proper divisors (788933985224).

1577867970442 is an equidigital number, since it uses as much as digits as its factorization.

1577867970442 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 788933985223.

The product of its (nonzero) digits is 165957120, while the sum is 67.

The spelling of 1577867970442 in words is "one trillion, five hundred seventy-seven billion, eight hundred sixty-seven million, nine hundred seventy thousand, four hundred forty-two".