1661535741370 has 16 divisors (see below), whose sum is σ = 2991019230720. Its totient is φ = 664557652944.

The previous prime is 1661535741353. The next prime is 1661535741373. The reversal of 1661535741370 is 731475351661.

It is not an unprimeable number, because it can be changed into a prime (1661535741373) 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, 6957150 + ... + 7192009.

It is an arithmetic number, because the mean of its divisors is an integer number (186938701920).

Almost surely, 2^{1661535741370} is an apocalyptic number.

1661535741370 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1661535741370 is a deficient number, since it is larger than the sum of its proper divisors (1329483489350).

1661535741370 is a wasteful number, since it uses less digits than its factorization.

1661535741370 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14160909.

The product of its (nonzero) digits is 1587600, while the sum is 49.

The spelling of 1661535741370 in words is "one trillion, six hundred sixty-one billion, five hundred thirty-five million, seven hundred forty-one thousand, three hundred seventy".