61335323640 has 96 divisors (see below), whose sum is σ = 206213623200. Its totient is φ = 15792080640.

The previous prime is 61335323603. The next prime is 61335323641. The reversal of 61335323640 is 4632353316.

61335323640 is a `hidden beast` number, since 6 + 1 + 3 + 3 + 5 + 3 + 2 + 3 + 640 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 61335323595 and 61335323604.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61335323641) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2927076 + ... + 2947955.

It is an arithmetic number, because the mean of its divisors is an integer number (2148058575).

Almost surely, 2^61335323640 is an apocalyptic number.

61335323640 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

61335323640 is an abundant number, since it is smaller than the sum of its proper divisors (144878299560).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

61335323640 is a wasteful number, since it uses less digits than its factorization.

61335323640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5875077 (or 5875070 counting only the distinct ones).

The product of its (nonzero) digits is 116640, while the sum is 36.

Adding to 61335323640 its reverse (4632353316), we get a palindrome (65967676956).

The spelling of 61335323640 in words is "sixty-one billion, three hundred thirty-five million, three hundred twenty-three thousand, six hundred forty".