1655707457 has 4 divisors (see below), whose sum is σ = 1655805360. Its totient is φ = 1655609556.

The previous prime is 1655707441. The next prime is 1655707477. The reversal of 1655707457 is 7547075561.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 7547075561 = 63617 ⋅118633.

It is a cyclic number.

It is not a de Polignac number, because 1655707457 - 2⁴ = 1655707441 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1655707477) 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, 16343 + ... + 59820.

It is an arithmetic number, because the mean of its divisors is an integer number (413951340).

Almost surely, 2^1655707457 is an apocalyptic number.

It is an amenable number.

1655707457 is a deficient number, since it is larger than the sum of its proper divisors (97903).

1655707457 is an equidigital number, since it uses as much as digits as its factorization.

1655707457 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 97902.

The product of its (nonzero) digits is 1029000, while the sum is 47.

The square root of 1655707457 is about 40690.3853139780. The cubic root of 1655707457 is about 1183.0266686569.

The spelling of 1655707457 in words is "one billion, six hundred fifty-five million, seven hundred seven thousand, four hundred fifty-seven".