2157385250286 has 144 divisors (see below), whose sum is σ = 5776416238320. Its totient is φ = 601361470080.

The previous prime is 2157385250281. The next prime is 2157385250323. The reversal of 2157385250286 is 6820525837512.

It is a happy number.

2157385250286 is a `hidden beast` number, since 2 + 1 + 5 + 7 + 3 + 8 + 52 + 502 + 86 = 666.

It is a super-2 number, since 2×2157385250286² (a number of 25 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2157385250281) by changing a digit.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 128421 + ... + 2081168.

It is an arithmetic number, because the mean of its divisors is an integer number (40114001655).

Almost surely, 2^{2157385250286} is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 2157385250286, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2888208119160).

2157385250286 is an abundant number, since it is smaller than the sum of its proper divisors (3619030988034).

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

2157385250286 is a wasteful number, since it uses less digits than its factorization.

2157385250286 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2209661 (or 2209642 counting only the distinct ones).

The product of its (nonzero) digits is 8064000, while the sum is 54.

The spelling of 2157385250286 in words is "two trillion, one hundred fifty-seven billion, three hundred eighty-five million, two hundred fifty thousand, two hundred eighty-six".