157221487530 has 24 divisors (see below), whose sum is σ = 408775867812. Its totient is φ = 41925729984.

The previous prime is 157221487529. The next prime is 157221487531. The reversal of 157221487530 is 35784122751.

157221487530 is a `hidden beast` number, since 1 + 5 + 7 + 22 + 14 + 87 + 530 = 666.

It is an interprime number because it is at equal distance from previous prime (157221487529) and next prime (157221487531).

It can be written as a sum of positive squares in 2 ways, for example, as 156561871041 + 659616489 = 395679^2 + 25683^2 .

It is a super-2 number, since 2×157221487530² (a number of 23 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is not an unprimeable number, because it can be changed into a prime (157221487531) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 873452619 + ... + 873452798.

Almost surely, 2^157221487530 is an apocalyptic number.

157221487530 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

157221487530 is an abundant number, since it is smaller than the sum of its proper divisors (251554380282).

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

157221487530 is a wasteful number, since it uses less digits than its factorization.

157221487530 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1746905430 (or 1746905427 counting only the distinct ones).

The product of its (nonzero) digits is 470400, while the sum is 45.

The spelling of 157221487530 in words is "one hundred fifty-seven billion, two hundred twenty-one million, four hundred eighty-seven thousand, five hundred thirty".