99701220025 has 27 divisors (see below), whose sum is σ = 135913965229. Its totient is φ = 72497348000.

The previous prime is 99701220023. The next prime is 99701220071. The reversal of 99701220025 is 52002210799.

The square root of 99701220025 is 315755.

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 1997464249 + 97703755776 = 44693^2 + 312576^2 .

It is not a de Polignac number, because 99701220025 - 2¹ = 99701220023 is a prime.

It is a super-2 number, since 2×99701220025² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (99701220023) 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, 17363655 + ... + 17369395.

Almost surely, 2^99701220025 is an apocalyptic number.

99701220025 is the 315755-th square number.

99701220025 is the 157878-th centered octagonal number.

It is an amenable number.

99701220025 is a deficient number, since it is larger than the sum of its proper divisors (36212745204).

99701220025 is an frugal number, since it uses more digits than its factorization.

99701220025 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11514 (or 5757 counting only the distinct ones).

The product of its (nonzero) digits is 22680, while the sum is 37.

The spelling of 99701220025 in words is "ninety-nine billion, seven hundred one million, two hundred twenty thousand, twenty-five".