99551649978381 has 16 divisors (see below), whose sum is σ = 140782932650304. Its totient is φ = 62357368468224.

The previous prime is 99551649978371. The next prime is 99551649978409. The reversal of 99551649978381 is 18387994615599.

It is not a de Polignac number, because 99551649978381 - 2⁶ = 99551649978317 is a prime.

It is a super-2 number, since 2×99551649978381² (a number of 29 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 99551649978294 and 99551649978303.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (99551649978371) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1662655870 + ... + 1662715743.

It is an arithmetic number, because the mean of its divisors is an integer number (8798933290644).

Almost surely, 2^{99551649978381} is an apocalyptic number.

It is an amenable number.

99551649978381 is a deficient number, since it is larger than the sum of its proper divisors (41231282671923).

99551649978381 is a wasteful number, since it uses less digits than its factorization.

99551649978381 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3325372220.

The product of its digits is 5290790400, while the sum is 84.

The spelling of 99551649978381 in words is "ninety-nine trillion, five hundred fifty-one billion, six hundred forty-nine million, nine hundred seventy-eight thousand, three hundred eighty-one".