1557190139651 has 4 divisors (see below), whose sum is σ = 1559545949904. Its totient is φ = 1554834329400.

The previous prime is 1557190139509. The next prime is 1557190139809. The reversal of 1557190139651 is 1569310917551.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1557190139651 is a prime.

It is a super-2 number, since 2×1557190139651² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1557190139593 and 1557190139602.

It is not an unprimeable number, because it can be changed into a prime (1557190133651) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1177904135 + ... + 1177905456.

It is an arithmetic number, because the mean of its divisors is an integer number (389886487476).

Almost surely, 2^{1557190139651} is an apocalyptic number.

1557190139651 is a deficient number, since it is larger than the sum of its proper divisors (2355810253).

1557190139651 is an equidigital number, since it uses as much as digits as its factorization.

1557190139651 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2355810252.

The product of its (nonzero) digits is 1275750, while the sum is 53.

The spelling of 1557190139651 in words is "one trillion, five hundred fifty-seven billion, one hundred ninety million, one hundred thirty-nine thousand, six hundred fifty-one".