2157726601806 has 8 divisors (see below), whose sum is σ = 4315453203624. Its totient is φ = 719242200600.

The previous prime is 2157726601739. The next prime is 2157726601841. The reversal of 2157726601806 is 6081066277512.

It is a sphenic number, since it is the product of 3 distinct primes.

2157726601806 is an admirable number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 179810550145 + ... + 179810550156.

It is an arithmetic number, because the mean of its divisors is an integer number (539431650453).

Almost surely, 2^{2157726601806} is an apocalyptic number.

2157726601806 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

2157726601806 is a wasteful number, since it uses less digits than its factorization.

2157726601806 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 359621100306.

The product of its (nonzero) digits is 1693440, while the sum is 51.

The spelling of 2157726601806 in words is "two trillion, one hundred fifty-seven billion, seven hundred twenty-six million, six hundred one thousand, eight hundred six".