1615638025 has 9 divisors (see below), whose sum is σ = 2003640391. Its totient is φ = 1292349640.

The previous prime is 1615638023. The next prime is 1615638029. The reversal of 1615638025 is 5208365161.

The square root of 1615638025 is 40195.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in only one way, i.e., 581629689 + 1034008336 = 24117^2 + 32156^2 .

It is not a de Polignac number, because 1615638025 - 2¹ = 1615638023 is a prime.

It is a super-2 number, since 2×1615638025² = 5220572455651801250, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1615638023) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 196956 + ... + 204994.

Almost surely, 2^1615638025 is an apocalyptic number.

1615638025 is the 40195-th square number.

1615638025 is the 20098-th centered octagonal number.

It is an amenable number.

1615638025 is a deficient number, since it is larger than the sum of its proper divisors (388002366).

1615638025 is an frugal number, since it uses more digits than its factorization.

1615638025 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16088 (or 8044 counting only the distinct ones).

The product of its (nonzero) digits is 43200, while the sum is 37.

The cubic root of 1615638025 is about 1173.4052365239.

The spelling of 1615638025 in words is "one billion, six hundred fifteen million, six hundred thirty-eight thousand, twenty-five".