2156406536 has 8 divisors (see below), whose sum is σ = 4043262270. Its totient is φ = 1078203264.

The previous prime is 2156406503. The next prime is 2156406587. The reversal of 2156406536 is 6356046512.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 2098189636 + 58216900 = 45806^2 + 7630^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is a self number, because there is not a number n which added to its sum of digits gives 2156406536.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 134775401 + ... + 134775416.

Almost surely, 2^2156406536 is an apocalyptic number.

It is an amenable number.

2156406536 is a deficient number, since it is larger than the sum of its proper divisors (1886855734).

2156406536 is a wasteful number, since it uses less digits than its factorization.

2156406536 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 269550823 (or 269550819 counting only the distinct ones).

The product of its (nonzero) digits is 129600, while the sum is 38.

The square root of 2156406536 is about 46437.1245449156. The cubic root of 2156406536 is about 1291.9435750646.

The spelling of 2156406536 in words is "two billion, one hundred fifty-six million, four hundred six thousand, five hundred thirty-six".