99876036781 has 2 divisors, whose sum is σ = 99876036782. Its totient is φ = 99876036780.

The previous prime is 99876036739. The next prime is 99876036803. The reversal of 99876036781 is 18763067899.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 54690031881 + 45186004900 = 233859^2 + 212570^2 .

It is a cyclic number.

It is not a de Polignac number, because 99876036781 - 2¹³ = 99876028589 is a prime.

It is a super-2 number, since 2×99876036781² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (99876036181) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 49938018390 + 49938018391.

It is an arithmetic number, because the mean of its divisors is an integer number (49938018391).

Almost surely, 2^99876036781 is an apocalyptic number.

It is an amenable number.

99876036781 is a deficient number, since it is larger than the sum of its proper divisors (1).

99876036781 is an equidigital number, since it uses as much as digits as its factorization.

99876036781 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 27433728, while the sum is 64.

The spelling of 99876036781 in words is "ninety-nine billion, eight hundred seventy-six million, thirty-six thousand, seven hundred eighty-one".