997651380625 has 15 divisors (see below), whose sum is σ = 1246696369303. Its totient is φ = 798101128000.

The previous prime is 997651380611. The next prime is 997651380629. The reversal of 997651380625 is 526083156799.

The square root of 997651380625 is 998825.

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

997651380625 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 7 ways, for example, as 523514472849 + 474136907776 = 723543^2 + 688576^2 .

It is not a de Polignac number, because 997651380625 - 2²⁵ = 997617826193 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (997651380629) by changing a digit.

It is a polite number, since it can be written in 14 ways as a sum of consecutive naturals, for example, 24950649 + ... + 24990601.

Almost surely, 2^997651380625 is an apocalyptic number.

997651380625 is the 998825-th square number.

997651380625 is the 499413-rd centered octagonal number.

It is an amenable number.

997651380625 is a deficient number, since it is larger than the sum of its proper divisors (249044988678).

997651380625 is an frugal number, since it uses more digits than its factorization.

997651380625 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 79926 (or 39958 counting only the distinct ones).

The product of its (nonzero) digits is 24494400, while the sum is 61.

It can be divided in two parts, 997651 and 380625, that added together give a square (1378276 = 1174²).

The spelling of 997651380625 in words is "nine hundred ninety-seven billion, six hundred fifty-one million, three hundred eighty thousand, six hundred twenty-five".