1661372337 has 4 divisors (see below), whose sum is σ = 2215163120. Its totient is φ = 1107581556.

The previous prime is 1661372303. The next prime is 1661372347. The reversal of 1661372337 is 7332731661.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 1661372337 - 2¹¹ = 1661370289 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1661372295 and 1661372304.

It is not an unprimeable number, because it can be changed into a prime (1661372347) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 276895387 + ... + 276895392.

It is an arithmetic number, because the mean of its divisors is an integer number (553790780).

Almost surely, 2^1661372337 is an apocalyptic number.

It is an amenable number.

1661372337 is a deficient number, since it is larger than the sum of its proper divisors (553790783).

1661372337 is an equidigital number, since it uses as much as digits as its factorization.

1661372337 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 553790782.

The product of its digits is 95256, while the sum is 39.

The square root of 1661372337 is about 40759.9354391049. The cubic root of 1661372337 is about 1184.3743454368.

The spelling of 1661372337 in words is "one billion, six hundred sixty-one million, three hundred seventy-two thousand, three hundred thirty-seven".