157866262493 has 4 divisors (see below), whose sum is σ = 160028814108. Its totient is φ = 155703710880.

The previous prime is 157866262459. The next prime is 157866262501. The reversal of 157866262493 is 394262668751.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 88169206489 + 69697056004 = 296933^2 + 264002^2 .

It is a cyclic number.

It is not a de Polignac number, because 157866262493 - 2⁶ = 157866262429 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (157866262403) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1081275698 + ... + 1081275843.

It is an arithmetic number, because the mean of its divisors is an integer number (40007203527).

Almost surely, 2^157866262493 is an apocalyptic number.

It is an amenable number.

157866262493 is a deficient number, since it is larger than the sum of its proper divisors (2162551615).

157866262493 is an equidigital number, since it uses as much as digits as its factorization.

157866262493 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2162551614.

The product of its digits is 26127360, while the sum is 59.

The spelling of 157866262493 in words is "one hundred fifty-seven billion, eight hundred sixty-six million, two hundred sixty-two thousand, four hundred ninety-three".