1655081057 has 4 divisors (see below), whose sum is σ = 1891521216. Its totient is φ = 1418640900.

The previous prime is 1655081017. The next prime is 1655081059. The reversal of 1655081057 is 7501805561.

It is a happy number.

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.

It is a cyclic number.

It is not a de Polignac number, because 1655081057 - 2¹² = 1655076961 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1655081057.

It is not an unprimeable number, because it can be changed into a prime (1655081059) 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, 118220069 + ... + 118220082.

It is an arithmetic number, because the mean of its divisors is an integer number (472880304).

Almost surely, 2^1655081057 is an apocalyptic number.

It is an amenable number.

1655081057 is a deficient number, since it is larger than the sum of its proper divisors (236440159).

1655081057 is an equidigital number, since it uses as much as digits as its factorization.

1655081057 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 236440158.

The product of its (nonzero) digits is 42000, while the sum is 38.

The square root of 1655081057 is about 40682.6874358123. The cubic root of 1655081057 is about 1182.8774592510.

The spelling of 1655081057 in words is "one billion, six hundred fifty-five million, eighty-one thousand, fifty-seven".