1656651602 has 4 divisors (see below), whose sum is σ = 2484977406. Its totient is φ = 828325800.

The previous prime is 1656651589. The next prime is 1656651631. The reversal of 1656651602 is 2061566561.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 2061566561 = 509 ⋅4050229.

It can be written as a sum of positive squares in only one way, i.e., 1047104881 + 609546721 = 32359^2 + 24689^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 414162899 + ... + 414162902.

Almost surely, 2^1656651602 is an apocalyptic number.

1656651602 is a deficient number, since it is larger than the sum of its proper divisors (828325804).

1656651602 is an equidigital number, since it uses as much as digits as its factorization.

1656651602 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 828325803.

The product of its (nonzero) digits is 64800, while the sum is 38.

The square root of 1656651602 is about 40701.9852341382. The cubic root of 1656651602 is about 1183.2514942983.

The spelling of 1656651602 in words is "one billion, six hundred fifty-six million, six hundred fifty-one thousand, six hundred two".