1373573661 has 24 divisors (see below), whose sum is σ = 1926606240. Its totient is φ = 869440320.

The previous prime is 1373573627. The next prime is 1373573713. The reversal of 1373573661 is 1663753731.

It is not a de Polignac number, because 1373573661 - 2¹⁰ = 1373572637 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1373575661) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 321606 + ... + 325848.

It is an arithmetic number, because the mean of its divisors is an integer number (80275260).

Almost surely, 2^1373573661 is an apocalyptic number.

It is an amenable number.

1373573661 is a deficient number, since it is larger than the sum of its proper divisors (553032579).

1373573661 is an equidigital number, since it uses as much as digits as its factorization.

1373573661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4397 (or 4336 counting only the distinct ones).

The product of its digits is 238140, while the sum is 42.

The square root of 1373573661 is about 37061.7546940239. The cubic root of 1373573661 is about 1111.6054092805.

The spelling of 1373573661 in words is "one billion, three hundred seventy-three million, five hundred seventy-three thousand, six hundred sixty-one".