87457181796557 has 4 divisors (see below), whose sum is σ = 87460443568860. Its totient is φ = 87453920024256.

The previous prime is 87457181796553. The next prime is 87457181796559. The reversal of 87457181796557 is 75569718175478.

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 35601138955561 + 51856042840996 = 5966669^2 + 7201114^2 .

It is a cyclic number.

It is not a de Polignac number, because 87457181796557 - 2² = 87457181796553 is a prime.

It is a super-2 number, since 2×87457181796557² (a number of 29 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (87457181796553) 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, 1630845932 + ... + 1630899557.

It is an arithmetic number, because the mean of its divisors is an integer number (21865110892215).

Almost surely, 2^{87457181796557} is an apocalyptic number.

It is an amenable number.

87457181796557 is a deficient number, since it is larger than the sum of its proper divisors (3261772303).

87457181796557 is a wasteful number, since it uses less digits than its factorization.

87457181796557 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3261772302.

The product of its digits is 4148928000, while the sum is 80.

The spelling of 87457181796557 in words is "eighty-seven trillion, four hundred fifty-seven billion, one hundred eighty-one million, seven hundred ninety-six thousand, five hundred fifty-seven".