61640011 has 4 divisors (see below), whose sum is σ = 65265912. Its totient is φ = 58014112.

The previous prime is 61640003. The next prime is 61640017. The reversal of 61640011 is 11004616.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 61640011 - 2³ = 61640003 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (61640017) 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, 1812925 + ... + 1812958.

It is an arithmetic number, because the mean of its divisors is an integer number (16316478).

Almost surely, 2^61640011 is an apocalyptic number.

61640011 is a deficient number, since it is larger than the sum of its proper divisors (3625901).

61640011 is a wasteful number, since it uses less digits than its factorization.

61640011 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3625900.

The product of its (nonzero) digits is 144, while the sum is 19.

The square root of 61640011 is about 7851.1152710937. The cubic root of 61640011 is about 395.0216534623.

Adding to 61640011 its reverse (11004616), we get a palindrome (72644627).

The spelling of 61640011 in words is "sixty-one million, six hundred forty thousand, eleven".