661152286380 has 24 divisors (see below), whose sum is σ = 1851226402032. Its totient is φ = 176307276352.

The previous prime is 661152286369. The next prime is 661152286397. The reversal of 661152286380 is 83682251166.

It is a happy number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5509602327 + ... + 5509602446.

It is an arithmetic number, because the mean of its divisors is an integer number (77134433418).

Almost surely, 2^661152286380 is an apocalyptic number.

661152286380 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

661152286380 is an abundant number, since it is smaller than the sum of its proper divisors (1190074115652).

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

661152286380 is a wasteful number, since it uses less digits than its factorization.

661152286380 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11019204785 (or 11019204783 counting only the distinct ones).

The product of its (nonzero) digits is 829440, while the sum is 48.

The spelling of 661152286380 in words is "six hundred sixty-one billion, one hundred fifty-two million, two hundred eighty-six thousand, three hundred eighty".