661055015412 has 72 divisors (see below), whose sum is σ = 1823242468320. Its totient is φ = 200283088320.

The previous prime is 661055015339. The next prime is 661055015417. The reversal of 661055015412 is 214510550166.

661055015412 is a `hidden beast` number, since 6 + 6 + 105 + 5 + 0 + 1 + 541 + 2 = 666.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (661055015417) 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, 2057139 + ... + 2356677.

It is an arithmetic number, because the mean of its divisors is an integer number (25322812060).

Almost surely, 2^661055015412 is an apocalyptic number.

It is an amenable number.

661055015412 is an abundant number, since it is smaller than the sum of its proper divisors (1162187452908).

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

661055015412 is a wasteful number, since it uses less digits than its factorization.

661055015412 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 305133 (or 305128 counting only the distinct ones).

The product of its (nonzero) digits is 36000, while the sum is 36.

Adding to 661055015412 its reverse (214510550166), we get a palindrome (875565565578).

It can be divided in two parts, 6610550154 and 12, that added together give a palindrome (6610550166).

The spelling of 661055015412 in words is "six hundred sixty-one billion, fifty-five million, fifteen thousand, four hundred twelve".