2531566642 has 16 divisors (see below), whose sum is σ = 4170003264. Its totient is φ = 1143090000.

The previous prime is 2531566619. The next prime is 2531566657. The reversal of 2531566642 is 2466651352.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 2531566595 and 2531566604.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 377709 + ... + 384352.

It is an arithmetic number, because the mean of its divisors is an integer number (260625204).

Almost surely, 2^2531566642 is an apocalyptic number.

2531566642 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

2531566642 is a deficient number, since it is larger than the sum of its proper divisors (1638436622).

2531566642 is a wasteful number, since it uses less digits than its factorization.

2531566642 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 762225.

The product of its digits is 259200, while the sum is 40.

The square root of 2531566642 is about 50314.6762088359. The cubic root of 2531566642 is about 1362.8972695830.

The spelling of 2531566642 in words is "two billion, five hundred thirty-one million, five hundred sixty-six thousand, six hundred forty-two".