67661129 has 4 divisors (see below), whose sum is σ = 68293584. Its totient is φ = 67028676.

The previous prime is 67661117. The next prime is 67661171. The reversal of 67661129 is 92116676.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 67661129 - 2²⁴ = 50883913 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 67661092 and 67661101.

It is not an unprimeable number, because it can be changed into a prime (67663129) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 316067 + ... + 316280.

It is an arithmetic number, because the mean of its divisors is an integer number (17073396).

Almost surely, 2^67661129 is an apocalyptic number.

It is an amenable number.

67661129 is a deficient number, since it is larger than the sum of its proper divisors (632455).

67661129 is a wasteful number, since it uses less digits than its factorization.

67661129 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 632454.

The product of its digits is 27216, while the sum is 38.

The square root of 67661129 is about 8225.6385162491. The cubic root of 67661129 is about 407.4863638530.

The spelling of 67661129 in words is "sixty-seven million, six hundred sixty-one thousand, one hundred twenty-nine".