1656155421 has 6 divisors (see below), whose sum is σ = 2392224510. Its totient is φ = 1104103608.

The previous prime is 1656155407. The next prime is 1656155489. The reversal of 1656155421 is 1245516561.

1656155421 is a `hidden beast` number, since 1 + 6 + 561 + 55 + 42 + 1 = 666.

It can be written as a sum of positive squares in only one way, i.e., 1643410521 + 12744900 = 40539^2 + 3570^2 .

It is not a de Polignac number, because 1656155421 - 2¹⁰ = 1656154397 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1656155021) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 92008626 + ... + 92008643.

It is an arithmetic number, because the mean of its divisors is an integer number (398704085).

Almost surely, 2^1656155421 is an apocalyptic number.

It is an amenable number.

1656155421 is a deficient number, since it is larger than the sum of its proper divisors (736069089).

1656155421 is a wasteful number, since it uses less digits than its factorization.

1656155421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 184017275 (or 184017272 counting only the distinct ones).

The product of its digits is 36000, while the sum is 36.

The square root of 1656155421 is about 40695.8894853031. The cubic root of 1656155421 is about 1183.1333512654.

The spelling of 1656155421 in words is "one billion, six hundred fifty-six million, one hundred fifty-five thousand, four hundred twenty-one".