1557464561 has 8 divisors (see below), whose sum is σ = 1644396000. Its totient is φ = 1471029120.

The previous prime is 1557464549. The next prime is 1557464567. The reversal of 1557464561 is 1654647551.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1557464561 - 2¹⁴ = 1557448177 is a prime.

It is a super-3 number, since 3×1557464561³ (a number of 29 digits) contains 333 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1557464567) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 117536 + ... + 130113.

It is an arithmetic number, because the mean of its divisors is an integer number (205549500).

Almost surely, 2^1557464561 is an apocalyptic number.

It is an amenable number.

1557464561 is a deficient number, since it is larger than the sum of its proper divisors (86931439).

1557464561 is a wasteful number, since it uses less digits than its factorization.

1557464561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 247999.

The product of its digits is 504000, while the sum is 44.

The square root of 1557464561 is about 39464.7255279953. The cubic root of 1557464561 is about 1159.1493369479.

The spelling of 1557464561 in words is "one billion, five hundred fifty-seven million, four hundred sixty-four thousand, five hundred sixty-one".