2156603505472 has 42 divisors (see below), whose sum is σ = 4634025732438. Its totient is φ = 995355459072.

The previous prime is 2156603505439. The next prime is 2156603505479. The reversal of 2156603505472 is 2745053066512.

It is a happy number.

It can be written as a sum of positive squares in 3 ways, for example, as 252711311616 + 1903892193856 = 502704^2 + 1379816^2 .

It is a hoax number, since the sum of its digits (46) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2156603505479) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 99684243 + ... + 99705874.

Almost surely, 2^{2156603505472} is an apocalyptic number.

It is an amenable number.

2156603505472 is an abundant number, since it is smaller than the sum of its proper divisors (2477422226966).

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

2156603505472 is a wasteful number, since it uses less digits than its factorization.

2156603505472 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 199390155 (or 199390132 counting only the distinct ones).

The product of its (nonzero) digits is 1512000, while the sum is 46.

The spelling of 2156603505472 in words is "two trillion, one hundred fifty-six billion, six hundred three million, five hundred five thousand, four hundred seventy-two".