99764381025 has 45 divisors (see below), whose sum is σ = 184824452131. Its totient is φ = 53200089360.

The previous prime is 99764380987. The next prime is 99764381029. The reversal of 99764381025 is 52018346799.

The square root of 99764381025 is 315855.

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

It can be written as a sum of positive squares in only one way, i.e., 35915177169 + 63849203856 = 189513^2 + 252684^2 .

It is a tau number, because it is divible by the number of its divisors (45).

It is not a de Polignac number, because 99764381025 - 2⁷ = 99764380897 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (99764381029) by changing a digit.

It is a polite number, since it can be written in 44 ways as a sum of consecutive naturals, for example, 14209966 + ... + 14216984.

It is a 1-persistent number, because it is pandigital, but 2⋅99764381025 = 199528762050 is not.

Almost surely, 2^99764381025 is an apocalyptic number.

99764381025 is the 315855-th square number.

99764381025 is the 157928-th centered octagonal number.

It is an amenable number.

99764381025 is a deficient number, since it is larger than the sum of its proper divisors (85060071106).

99764381025 is an frugal number, since it uses more digits than its factorization.

99764381025 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14060 (or 7027 counting only the distinct ones).

The product of its (nonzero) digits is 3265920, while the sum is 54.

The spelling of 99764381025 in words is "ninety-nine billion, seven hundred sixty-four million, three hundred eighty-one thousand, twenty-five".