1656121252 has 6 divisors (see below), whose sum is σ = 2898212198. Its totient is φ = 828060624.

The previous prime is 1656121223. The next prime is 1656121261. The reversal of 1656121252 is 2521216561.

It can be written as a sum of positive squares in only one way, i.e., 1528340836 + 127780416 = 39094^2 + 11304^2 .

It is an alternating number because its digits alternate between odd and even.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 207015153 + ... + 207015160.

Almost surely, 2^1656121252 is an apocalyptic number.

It is an amenable number.

1656121252 is a deficient number, since it is larger than the sum of its proper divisors (1242090946).

1656121252 is a wasteful number, since it uses less digits than its factorization.

1656121252 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 414030317 (or 414030315 counting only the distinct ones).

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

The square root of 1656121252 is about 40695.4696741541. The cubic root of 1656121252 is about 1183.1252145972.

The spelling of 1656121252 in words is "one billion, six hundred fifty-six million, one hundred twenty-one thousand, two hundred fifty-two".