980177221521 has 27 divisors (see below), whose sum is σ = 1420775434377. Its totient is φ = 651168451080.

The previous prime is 980177221511. The next prime is 980177221531. The reversal of 980177221521 is 125122771089.

The square root of 980177221521 is 990039.

It is a perfect power (a square), and thus also a powerful number.

980177221521 is a `hidden beast` number, since 98 + 0 + 17 + 7 + 2 + 21 + 521 = 666.

It is an interprime number because it is at equal distance from previous prime (980177221511) and next prime (980177221531).

It is not a de Polignac number, because 980177221521 - 2¹⁷ = 980177090449 is a prime.

It is not an unprimeable number, because it can be changed into a prime (980177221511) by changing a digit.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 1553370876 + ... + 1553371506.

Almost surely, 2^980177221521 is an apocalyptic number.

980177221521 is the 990039-th square number.

980177221521 is the 495020-th centered octagonal number.

It is an amenable number.

980177221521 is a deficient number, since it is larger than the sum of its proper divisors (440598212856).

980177221521 is an frugal number, since it uses more digits than its factorization.

980177221521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2314 (or 1157 counting only the distinct ones).

The product of its (nonzero) digits is 141120, while the sum is 45.

The spelling of 980177221521 in words is "nine hundred eighty billion, one hundred seventy-seven million, two hundred twenty-one thousand, five hundred twenty-one".