99997655 has 32 divisors (see below), whose sum is σ = 132969600. Its totient is φ = 71852032.

The previous prime is 99997649. The next prime is 99997669. The reversal of 99997655 is 55679999.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-99997655 is a prime.

It is a nialpdrome in base 10.

It is a junction number, because it is equal to n+sod(n) for n = 99997594 and 99997603.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 278366 + ... + 278724.

It is an arithmetic number, because the mean of its divisors is an integer number (4155300).

Almost surely, 2^99997655 is an apocalyptic number.

99997655 is a deficient number, since it is larger than the sum of its proper divisors (32971945).

99997655 is a wasteful number, since it uses less digits than its factorization.

99997655 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 523.

The product of its digits is 6889050, while the sum is 59.

The square root of 99997655 is about 9999.8827493126. The cubic root of 99997655 is about 464.1552551576.

The spelling of 99997655 in words is "ninety-nine million, nine hundred ninety-seven thousand, six hundred fifty-five".