2520317661 has 8 divisors (see below), whose sum is σ = 3360847584. Its totient is φ = 1679999760.

The previous prime is 2520317651. The next prime is 2520317717. The reversal of 2520317661 is 1667130252.

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

It is not a de Polignac number, because 2520317661 - 2¹³ = 2520309469 is a prime.

It is a super-2 number, since 2×2520317661² = 12704002224697021842, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2520317651) 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, 22810 + ... + 74571.

It is an arithmetic number, because the mean of its divisors is an integer number (420105948).

Almost surely, 2^2520317661 is an apocalyptic number.

It is an amenable number.

2520317661 is a deficient number, since it is larger than the sum of its proper divisors (840529923).

2520317661 is an equidigital number, since it uses as much as digits as its factorization.

2520317661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 106011.

The product of its (nonzero) digits is 15120, while the sum is 33.

The square root of 2520317661 is about 50202.7654716351. The cubic root of 2520317661 is about 1360.8756005423.

The spelling of 2520317661 in words is "two billion, five hundred twenty million, three hundred seventeen thousand, six hundred sixty-one".