2521023661 has 8 divisors (see below), whose sum is σ = 2716895160. Its totient is φ = 2325430272.

The previous prime is 2521023641. The next prime is 2521023667. The reversal of 2521023661 is 1663201252.

It can be written as a sum of positive squares in 4 ways, for example, as 40386025 + 2480637636 = 6355^2 + 49806^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 2521023661 - 2¹⁷ = 2520892589 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2521023667) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 50500 + ... + 87133.

It is an arithmetic number, because the mean of its divisors is an integer number (339611895).

Almost surely, 2^2521023661 is an apocalyptic number.

It is an amenable number.

2521023661 is a deficient number, since it is larger than the sum of its proper divisors (195871499).

2521023661 is a wasteful number, since it uses less digits than its factorization.

2521023661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 139055.

The product of its (nonzero) digits is 4320, while the sum is 28.

The square root of 2521023661 is about 50209.7964644351. The cubic root of 2521023661 is about 1361.0026597210.

The spelling of 2521023661 in words is "two billion, five hundred twenty-one million, twenty-three thousand, six hundred sixty-one".