1661536953380 has 24 divisors (see below), whose sum is σ = 3489452628480. Its totient is φ = 664571919200.

The previous prime is 1661536953319. The next prime is 1661536953407. The reversal of 1661536953380 is 833596351661.

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, 2360090 + ... + 2982129.

It is an arithmetic number, because the mean of its divisors is an integer number (145393859520).

Almost surely, 2^{1661536953380} is an apocalyptic number.

1661536953380 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1661536953380 is an abundant number, since it is smaller than the sum of its proper divisors (1827915675100).

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

1661536953380 is a wasteful number, since it uses less digits than its factorization.

1661536953380 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5357779 (or 5357777 counting only the distinct ones).

The product of its (nonzero) digits is 10497600, while the sum is 56.

The spelling of 1661536953380 in words is "one trillion, six hundred sixty-one billion, five hundred thirty-six million, nine hundred fifty-three thousand, three hundred eighty".