1661489336748 has 24 divisors (see below), whose sum is σ = 3906402413760. Its totient is φ = 549602070160.

The previous prime is 1661489336737. The next prime is 1661489336809. The reversal of 1661489336748 is 8476339841661.

It is a super-2 number, since 2×1661489336748² (a number of 25 digits) contains 22 as substring.

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, 528461958 + ... + 528465101.

It is an arithmetic number, because the mean of its divisors is an integer number (162766767240).

Almost surely, 2^{1661489336748} is an apocalyptic number.

It is an amenable number.

1661489336748 is an abundant number, since it is smaller than the sum of its proper divisors (2244913077012).

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

1661489336748 is a wasteful number, since it uses less digits than its factorization.

1661489336748 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1056927197 (or 1056927195 counting only the distinct ones).

The product of its digits is 125411328, while the sum is 66.

The spelling of 1661489336748 in words is "one trillion, six hundred sixty-one billion, four hundred eighty-nine million, three hundred thirty-six thousand, seven hundred forty-eight".