66961153 has 4 divisors (see below), whose sum is σ = 76527040. Its totient is φ = 57395268.

The previous prime is 66961133. The next prime is 66961177. The reversal of 66961153 is 35116966.

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 de Polignac number, because none of the positive numbers 2^k-66961153 is a prime.

It is a super-2 number, since 2×66961153² = 8967592022178818, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66961133) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4782933 + ... + 4782946.

It is an arithmetic number, because the mean of its divisors is an integer number (19131760).

Almost surely, 2^66961153 is an apocalyptic number.

It is an amenable number.

66961153 is a deficient number, since it is larger than the sum of its proper divisors (9565887).

66961153 is an equidigital number, since it uses as much as digits as its factorization.

66961153 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9565886.

The product of its digits is 29160, while the sum is 37.

The square root of 66961153 is about 8182.9794696064. The cubic root of 66961153 is about 406.0762978741.

The spelling of 66961153 in words is "sixty-six million, nine hundred sixty-one thousand, one hundred fifty-three".