1557164747 has 4 divisors (see below), whose sum is σ = 1570945080. Its totient is φ = 1543384416.

The previous prime is 1557164731. The next prime is 1557164803. The reversal of 1557164747 is 7474617551.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 7474617551 = 45233 ⋅165247.

It is a cyclic number.

It is not a de Polignac number, because 1557164747 - 2⁴ = 1557164731 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1557164347) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6889997 + ... + 6890222.

It is an arithmetic number, because the mean of its divisors is an integer number (392736270).

Almost surely, 2^1557164747 is an apocalyptic number.

1557164747 is a deficient number, since it is larger than the sum of its proper divisors (13780333).

1557164747 is a wasteful number, since it uses less digits than its factorization.

1557164747 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13780332.

The product of its digits is 823200, while the sum is 47.

The square root of 1557164747 is about 39460.9268390898. The cubic root of 1557164747 is about 1159.0749529116.

The spelling of 1557164747 in words is "one billion, five hundred fifty-seven million, one hundred sixty-four thousand, seven hundred forty-seven".