100720543225 has 9 divisors (see below), whose sum is σ = 124895441293. Its totient is φ = 80575165120.

The previous prime is 100720543181. The next prime is 100720543241. The reversal of 100720543225 is 522345027001.

The square root of 100720543225 is 317365.

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

It can be written as a sum of positive squares in 4 ways, for example, as 16924188649 + 83796354576 = 130093^2 + 289476^2 .

It is a de Polignac number, because none of the positive numbers 2^k-100720543225 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 1555089 + ... + 1618561.

Almost surely, 2^100720543225 is an apocalyptic number.

100720543225 is the 317365-th square number.

100720543225 is the 158683-rd centered octagonal number.

It is an amenable number.

100720543225 is a deficient number, since it is larger than the sum of its proper divisors (24174898068).

100720543225 is an frugal number, since it uses more digits than its factorization.

100720543225 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 126956 (or 63478 counting only the distinct ones).

The product of its (nonzero) digits is 16800, while the sum is 31.

The spelling of 100720543225 in words is "one hundred billion, seven hundred twenty million, five hundred forty-three thousand, two hundred twenty-five".