1661723022280 has 32 divisors (see below), whose sum is σ = 3740566505400. Its totient is φ = 664388816896.

The previous prime is 1661723022257. The next prime is 1661723022301. The reversal of 1661723022280 is 822203271661.

It can be written as a sum of positive squares in 4 ways, for example, as 1592336086884 + 69386935396 = 1261878^2 + 263414^2 .

It is a super-2 number, since 2×1661723022280² (a number of 25 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (40).

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, 9297625 + ... + 9474664.

Almost surely, 2^{1661723022280} is an apocalyptic number.

1661723022280 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1661723022280 is an abundant number, since it is smaller than the sum of its proper divisors (2078843483120).

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

1661723022280 is a wasteful number, since it uses less digits than its factorization.

1661723022280 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18774513 (or 18774509 counting only the distinct ones).

The product of its (nonzero) digits is 96768, while the sum is 40.

The spelling of 1661723022280 in words is "one trillion, six hundred sixty-one billion, seven hundred twenty-three million, twenty-two thousand, two hundred eighty".