2660400642 has 16 divisors (see below), whose sum is σ = 5321318112. Its totient is φ = 886714080.

The previous prime is 2660400641. The next prime is 2660400649. The reversal of 2660400642 is 2460040662.

It is not an unprimeable number, because it can be changed into a prime (2660400641) 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, 89142 + ... + 115182.

It is an arithmetic number, because the mean of its divisors is an integer number (332582382).

Almost surely, 2^2660400642 is an apocalyptic number.

2660400642 is an abundant number, since it is smaller than the sum of its proper divisors (2660917470).

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

2660400642 is a wasteful number, since it uses less digits than its factorization.

2660400642 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 43073.

The product of its (nonzero) digits is 13824, while the sum is 30.

The square root of 2660400642 is about 51579.0717442646. The cubic root of 2660400642 is about 1385.6355421429.

The spelling of 2660400642 in words is "two billion, six hundred sixty million, four hundred thousand, six hundred forty-two".