2151635642 has 16 divisors (see below), whose sum is σ = 3481005192. Its totient is φ = 991552320.

The previous prime is 2151635587. The next prime is 2151635683. The reversal of 2151635642 is 2465361512.

2151635642 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 1482327001 + 669308641 = 38501^2 + 25871^2 .

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, 45413 + ... + 79784.

Almost surely, 2^2151635642 is an apocalyptic number.

2151635642 is a deficient number, since it is larger than the sum of its proper divisors (1329369550).

2151635642 is a wasteful number, since it uses less digits than its factorization.

2151635642 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 125873.

The product of its digits is 43200, while the sum is 35.

The square root of 2151635642 is about 46385.7267055287. The cubic root of 2151635642 is about 1290.9900942092.

The spelling of 2151635642 in words is "two billion, one hundred fifty-one million, six hundred thirty-five thousand, six hundred forty-two".