2520651666 has 16 divisors (see below), whose sum is σ = 5429096064. Its totient is φ = 775585104.

The previous prime is 2520651649. The next prime is 2520651697. The reversal of 2520651666 is 6661560252.

It is a happy number.

2520651666 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 16157946 + ... + 16158101.

It is an arithmetic number, because the mean of its divisors is an integer number (339318504).

Almost surely, 2^2520651666 is an apocalyptic number.

2520651666 is a gapful number since it is divisible by the number (26) formed by its first and last digit.

2520651666 is an abundant number, since it is smaller than the sum of its proper divisors (2908444398).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

2520651666 is a wasteful number, since it uses less digits than its factorization.

2520651666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32316065.

The product of its (nonzero) digits is 129600, while the sum is 39.

The square root of 2520651666 is about 50206.0919212002. The cubic root of 2520651666 is about 1360.9357145489.

The spelling of 2520651666 in words is "two billion, five hundred twenty million, six hundred fifty-one thousand, six hundred sixty-six".