1661315034120 has 128 divisors (see below), whose sum is σ = 5943586775040. Its totient is φ = 363219183360.

The previous prime is 1661315034101. The next prime is 1661315034161. The reversal of 1661315034120 is 214305131661.

It is a happy number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 42975376 + ... + 43014015.

It is an arithmetic number, because the mean of its divisors is an integer number (46434271680).

Almost surely, 2^{1661315034120} is an apocalyptic number.

1661315034120 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1661315034120 is an abundant number, since it is smaller than the sum of its proper divisors (4282271740920).

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

1661315034120 is a wasteful number, since it uses less digits than its factorization.

1661315034120 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 85989435 (or 85989431 counting only the distinct ones).

The product of its (nonzero) digits is 12960, while the sum is 33.

The spelling of 1661315034120 in words is "one trillion, six hundred sixty-one billion, three hundred fifteen million, thirty-four thousand, one hundred twenty".