102661155 has 16 divisors (see below), whose sum is σ = 182508960. Its totient is φ = 54752544.

The previous prime is 102661151. The next prime is 102661177. The reversal of 102661155 is 551166201.

It is a happy number.

It is not a de Polignac number, because 102661155 - 2² = 102661151 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is not an unprimeable number, because it can be changed into a prime (102661151) 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, 380092 + ... + 380361.

It is an arithmetic number, because the mean of its divisors is an integer number (11406810).

Almost surely, 2^102661155 is an apocalyptic number.

102661155 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

102661155 is a deficient number, since it is larger than the sum of its proper divisors (79847805).

102661155 is an equidigital number, since it uses as much as digits as its factorization.

102661155 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 760467 (or 760461 counting only the distinct ones).

The product of its (nonzero) digits is 1800, while the sum is 27.

The square root of 102661155 is about 10132.1841179481. The cubic root of 102661155 is about 468.2402202000.

The spelling of 102661155 in words is "one hundred two million, six hundred sixty-one thousand, one hundred fifty-five".