1657542641 has 8 divisors (see below), whose sum is σ = 1697215104. Its totient is φ = 1618323840.

The previous prime is 1657542611. The next prime is 1657542673. The reversal of 1657542641 is 1462457561.

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 1657542641 - 2²⁶ = 1590433777 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1657542611) 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, 106016 + ... + 120641.

It is an arithmetic number, because the mean of its divisors is an integer number (212151888).

Almost surely, 2^1657542641 is an apocalyptic number.

It is an amenable number.

1657542641 is a deficient number, since it is larger than the sum of its proper divisors (39672463).

1657542641 is a wasteful number, since it uses less digits than its factorization.

1657542641 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 226831.

The product of its digits is 201600, while the sum is 41.

The square root of 1657542641 is about 40712.9296538581. The cubic root of 1657542641 is about 1183.4635956757.

The spelling of 1657542641 in words is "one billion, six hundred fifty-seven million, five hundred forty-two thousand, six hundred forty-one".