661230361506 has 128 divisors (see below), whose sum is σ = 1731634329600. Its totient is φ = 164917416960.

The previous prime is 661230361483. The next prime is 661230361507. The reversal of 661230361506 is 605163032166.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is not an unprimeable number, because it can be changed into a prime (661230361507) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 915846 + ... + 1470113.

It is an arithmetic number, because the mean of its divisors is an integer number (13528393200).

Almost surely, 2^661230361506 is an apocalyptic number.

661230361506 is a gapful number since it is divisible by the number (66) formed by its first and last digit.

661230361506 is an abundant number, since it is smaller than the sum of its proper divisors (1070403968094).

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

661230361506 is a wasteful number, since it uses less digits than its factorization.

661230361506 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2386024.

The product of its (nonzero) digits is 116640, while the sum is 39.

The spelling of 661230361506 in words is "six hundred sixty-one billion, two hundred thirty million, three hundred sixty-one thousand, five hundred six".