157721765264 has 30 divisors (see below), whose sum is σ = 355477500774. Its totient is φ = 67595041920.

The previous prime is 157721765263. The next prime is 157721765287. The reversal of 157721765264 is 462567127751.

It can be written as a sum of positive squares in only one way, i.e., 134953369600 + 22768395664 = 367360^2 + 150892^2 .

It is a super-3 number, since 3×157721765264³ (a number of 35 digits) contains 333 as substring.

It is not an unprimeable number, because it can be changed into a prime (157721765261) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 100587077 + ... + 100588644.

Almost surely, 2^157721765264 is an apocalyptic number.

157721765264 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

It is an amenable number.

157721765264 is an abundant number, since it is smaller than the sum of its proper divisors (197755735510).

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

157721765264 is a wasteful number, since it uses less digits than its factorization.

157721765264 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 201175743 (or 201175730 counting only the distinct ones).

The product of its digits is 4939200, while the sum is 53.

The spelling of 157721765264 in words is "one hundred fifty-seven billion, seven hundred twenty-one million, seven hundred sixty-five thousand, two hundred sixty-four".