2061650864025 has 27 divisors (see below), whose sum is σ = 3692684346559. Its totient is φ = 1099535640720.

The previous prime is 2061650864017. The next prime is 2061650864041. The reversal of 2061650864025 is 5204680561602.

The square root of 2061650864025 is 1435845.

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

2061650864025 is a `hidden beast` number, since 2 + 0 + 6 + 165 + 0 + 86 + 402 + 5 = 666.

It can be written as a sum of positive squares in only one way, i.e., 742194311049 + 1319456552976 = 861507^2 + 1148676^2 .

It is not a de Polignac number, because 2061650864025 - 2³ = 2061650864017 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 21489814 + ... + 21585536.

Almost surely, 2^{2061650864025} is an apocalyptic number.

2061650864025 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

2061650864025 is the 1435845-th square number.

2061650864025 is the 717923-rd centered octagonal number.

It is an amenable number.

2061650864025 is a deficient number, since it is larger than the sum of its proper divisors (1631033482534).

2061650864025 is an frugal number, since it uses more digits than its factorization.

2061650864025 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 191462 (or 95731 counting only the distinct ones).

The product of its (nonzero) digits is 691200, while the sum is 45.

The spelling of 2061650864025 in words is "two trillion, sixty-one billion, six hundred fifty million, eight hundred sixty-four thousand, twenty-five".