2521662066 has 48 divisors (see below), whose sum is σ = 6811766208. Its totient is φ = 654976800.

The previous prime is 2521662061. The next prime is 2521662113. The reversal of 2521662066 is 6602661252.

2521662066 is a `hidden beast` number, since 2 + 5 + 21 + 6 + 620 + 6 + 6 = 666.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 2521662066.

It is not an unprimeable number, because it can be changed into a prime (2521662061) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 908305 + ... + 911076.

It is an arithmetic number, because the mean of its divisors is an integer number (141911796).

Almost surely, 2^2521662066 is an apocalyptic number.

2521662066 is an abundant number, since it is smaller than the sum of its proper divisors (4290104142).

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

2521662066 is a wasteful number, since it uses less digits than its factorization.

2521662066 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1819407 (or 1819404 counting only the distinct ones).

The product of its (nonzero) digits is 51840, while the sum is 36.

The square root of 2521662066 is about 50216.1534369171. The cubic root of 2521662066 is about 1361.1175333713.

The spelling of 2521662066 in words is "two billion, five hundred twenty-one million, six hundred sixty-two thousand, sixty-six".