1655120461 has 4 divisors (see below), whose sum is σ = 1657989532. Its totient is φ = 1652251392.

The previous prime is 1655120447. The next prime is 1655120471. The reversal of 1655120461 is 1640215561.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 780084900 + 875035561 = 27930^2 + 29581^2 .

It is a cyclic number.

It is not a de Polignac number, because 1655120461 - 2²⁹ = 1118249549 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1655120471) 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, 1433670 + ... + 1434823.

It is an arithmetic number, because the mean of its divisors is an integer number (414497383).

Almost surely, 2^1655120461 is an apocalyptic number.

It is an amenable number.

1655120461 is a deficient number, since it is larger than the sum of its proper divisors (2869071).

1655120461 is an equidigital number, since it uses as much as digits as its factorization.

1655120461 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2869070.

The product of its (nonzero) digits is 7200, while the sum is 31.

The square root of 1655120461 is about 40683.1717175542. The cubic root of 1655120461 is about 1182.8868464516.

The spelling of 1655120461 in words is "one billion, six hundred fifty-five million, one hundred twenty thousand, four hundred sixty-one".