1623645051 has 16 divisors (see below), whose sum is σ = 2505446400. Its totient is φ = 916051968.

The previous prime is 1623645043. The next prime is 1623645053. The reversal of 1623645051 is 1505463261.

It is not a de Polignac number, because 1623645051 - 2³ = 1623645043 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1623645053) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 487686 + ... + 491003.

It is an arithmetic number, because the mean of its divisors is an integer number (156590400).

Almost surely, 2^1623645051 is an apocalyptic number.

1623645051 is a deficient number, since it is larger than the sum of its proper divisors (881801349).

1623645051 is an equidigital number, since it uses as much as digits as its factorization.

1623645051 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 978778.

The product of its (nonzero) digits is 21600, while the sum is 33.

The square root of 1623645051 is about 40294.4791627836. The cubic root of 1623645051 is about 1175.3404900667.

The spelling of 1623645051 in words is "one billion, six hundred twenty-three million, six hundred forty-five thousand, fifty-one".