1671465557842 has 4 divisors (see below), whose sum is σ = 2507198336766. Its totient is φ = 835732778920.

The previous prime is 1671465557803. The next prime is 1671465557843. The reversal of 1671465557842 is 2487555641761.

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., 1477734415641 + 193731142201 = 1215621^2 + 440149^2 .

It is a super-2 number, since 2×1671465557842² (a number of 25 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1671465557843) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 417866389459 + ... + 417866389462.

Almost surely, 2^{1671465557842} is an apocalyptic number.

1671465557842 is a deficient number, since it is larger than the sum of its proper divisors (835732778924).

1671465557842 is an equidigital number, since it uses as much as digits as its factorization.

1671465557842 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 835732778923.

The product of its digits is 56448000, while the sum is 61.

The spelling of 1671465557842 in words is "one trillion, six hundred seventy-one billion, four hundred sixty-five million, five hundred fifty-seven thousand, eight hundred forty-two".