66961834 has 4 divisors (see below), whose sum is σ = 100442754. Its totient is φ = 33480916.

The previous prime is 66961813. The next prime is 66961859. The reversal of 66961834 is 43816966.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 43816966 = 2 ⋅21908483.

It can be written as a sum of positive squares in only one way, i.e., 65529025 + 1432809 = 8095^2 + 1197^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 16740457 + ... + 16740460.

Almost surely, 2^66961834 is an apocalyptic number.

66961834 is a deficient number, since it is larger than the sum of its proper divisors (33480920).

66961834 is a wasteful number, since it uses less digits than its factorization.

66961834 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33480919.

The product of its digits is 186624, while the sum is 43.

The square root of 66961834 is about 8183.0210802613. The cubic root of 66961834 is about 406.0776744784.

The spelling of 66961834 in words is "sixty-six million, nine hundred sixty-one thousand, eight hundred thirty-four".