7661821411506 has 16 divisors (see below), whose sum is σ = 15324449176800. Its totient is φ = 2553806078208.

The previous prime is 7661821411501. The next prime is 7661821411507. The reversal of 7661821411506 is 6051141281667.

It is not an unprimeable number, because it can be changed into a prime (7661821411501) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 33474516 + ... + 33702623.

It is an arithmetic number, because the mean of its divisors is an integer number (957778073550).

Almost surely, 2^{7661821411506} is an apocalyptic number.

7661821411506 is an abundant number, since it is smaller than the sum of its proper divisors (7662627765294).

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

7661821411506 is a wasteful number, since it uses less digits than its factorization.

7661821411506 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 67196153.

The product of its (nonzero) digits is 483840, while the sum is 48.

The spelling of 7661821411506 in words is "seven trillion, six hundred sixty-one billion, eight hundred twenty-one million, four hundred eleven thousand, five hundred six".