2154556402236 has 144 divisors (see below), whose sum is σ = 6460896658944. Its totient is φ = 615006374976.

The previous prime is 2154556402133. The next prime is 2154556402309. The reversal of 2154556402236 is 6322046554512.

2154556402236 is a `hidden beast` number, since 2 + 1 + 5 + 4 + 5 + 5 + 6 + 402 + 236 = 666.

It is a super-2 number, since 2×2154556402236² (a number of 25 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 2154556402191 and 2154556402200.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 7083706 + ... + 7381598.

Almost surely, 2^{2154556402236} is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 2154556402236, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3230448329472).

2154556402236 is an abundant number, since it is smaller than the sum of its proper divisors (4306340256708).

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

2154556402236 is a wasteful number, since it uses less digits than its factorization.

2154556402236 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 298982 (or 298968 counting only the distinct ones).

The product of its (nonzero) digits is 1728000, while the sum is 45.

The spelling of 2154556402236 in words is "two trillion, one hundred fifty-four billion, five hundred fifty-six million, four hundred two thousand, two hundred thirty-six".