66149755 has 24 divisors (see below), whose sum is σ = 93480912. Its totient is φ = 44799552.

The previous prime is 66149749. The next prime is 66149819. The reversal of 66149755 is 55794166.

It is not a de Polignac number, because 66149755 - 2⁵ = 66149723 is a prime.

It is a super-3 number, since 3×66149755³ (a number of 24 digits) contains 333 as substring.

It is a Smith number, since the sum of its digits (43) coincides with the sum of the digits of its prime factors.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 18709 + ... + 21961.

It is an arithmetic number, because the mean of its divisors is an integer number (3895038).

Almost surely, 2^66149755 is an apocalyptic number.

66149755 is the 4067-th decagonal number.

66149755 is a deficient number, since it is larger than the sum of its proper divisors (27331157).

66149755 is a wasteful number, since it uses less digits than its factorization.

66149755 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3355 (or 3348 counting only the distinct ones).

The product of its digits is 226800, while the sum is 43.

The square root of 66149755 is about 8133.2499654197. The cubic root of 66149755 is about 404.4294256696.

The spelling of 66149755 in words is "sixty-six million, one hundred forty-nine thousand, seven hundred fifty-five".