1655606651 has 4 divisors (see below), whose sum is σ = 1658925000. Its totient is φ = 1652288304.

The previous prime is 1655606599. The next prime is 1655606657. The reversal of 1655606651 is 1566065561.

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

It is a cyclic number.

It is not a de Polignac number, because 1655606651 - 2¹⁴ = 1655590267 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1655606599 and 1655606608.

It is not an unprimeable number, because it can be changed into a prime (1655606657) 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, 1658426 + ... + 1659423.

It is an arithmetic number, because the mean of its divisors is an integer number (414731250).

Almost surely, 2^1655606651 is an apocalyptic number.

1655606651 is a deficient number, since it is larger than the sum of its proper divisors (3318349).

1655606651 is an equidigital number, since it uses as much as digits as its factorization.

1655606651 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3318348.

The product of its (nonzero) digits is 162000, while the sum is 41.

The square root of 1655606651 is about 40689.1465995540. The cubic root of 1655606651 is about 1183.0026590598.

The spelling of 1655606651 in words is "one billion, six hundred fifty-five million, six hundred six thousand, six hundred fifty-one".