2516661642 has 32 divisors (see below), whose sum is σ = 5545278144. Its totient is φ = 755072000.

The previous prime is 2516661611. The next prime is 2516661643. The reversal of 2516661642 is 2461666152.

It is a self number, because there is not a number n which added to its sum of digits gives 2516661642.

It is not an unprimeable number, because it can be changed into a prime (2516661643) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 182103 + ... + 195434.

It is an arithmetic number, because the mean of its divisors is an integer number (173289942).

Almost surely, 2^2516661642 is an apocalyptic number.

2516661642 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

2516661642 is an abundant number, since it is smaller than the sum of its proper divisors (3028616502).

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

2516661642 is a wasteful number, since it uses less digits than its factorization.

2516661642 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 377654.

The product of its digits is 103680, while the sum is 39.

The square root of 2516661642 is about 50166.3397309391. The cubic root of 2516661642 is about 1360.2172450678.

The spelling of 2516661642 in words is "two billion, five hundred sixteen million, six hundred sixty-one thousand, six hundred forty-two".