1618515625 has 16 divisors (see below), whose sum is σ = 2023237008. Its totient is φ = 1294750000.

The previous prime is 1618515601. The next prime is 1618515637. The reversal of 1618515625 is 5265158161.

It can be written as a sum of positive squares in 8 ways, for example, as 760435776 + 858079849 = 27576^2 + 29293^2 .

It is not a de Polignac number, because 1618515625 - 2⁵ = 1618515593 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 67767 + ... + 88483.

It is an arithmetic number, because the mean of its divisors is an integer number (126452313).

Almost surely, 2^1618515625 is an apocalyptic number.

It is an amenable number.

1618515625 is a deficient number, since it is larger than the sum of its proper divisors (404721383).

1618515625 is an frugal number, since it uses more digits than its factorization.

1618515625 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20752 (or 20722 counting only the distinct ones).

The product of its digits is 72000, while the sum is 40.

The square root of 1618515625 is about 40230.7795723623. The cubic root of 1618515625 is about 1174.1014709040.

The spelling of 1618515625 in words is "one billion, six hundred eighteen million, five hundred fifteen thousand, six hundred twenty-five".