1661740374 has 64 divisors (see below), whose sum is σ = 3956124672. Its totient is φ = 455414400.

The previous prime is 1661740357. The next prime is 1661740387. The reversal of 1661740374 is 4730471661.

It is a super-2 number, since 2×1661740374² = 5522762141163319752, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 102804 + ... + 117864.

It is an arithmetic number, because the mean of its divisors is an integer number (61814448).

Almost surely, 2^1661740374 is an apocalyptic number.

1661740374 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 1661740374, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1978062336).

1661740374 is an abundant number, since it is smaller than the sum of its proper divisors (2294384298).

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

1661740374 is a wasteful number, since it uses less digits than its factorization.

1661740374 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15181.

The product of its (nonzero) digits is 84672, while the sum is 39.

The square root of 1661740374 is about 40764.4498797666. The cubic root of 1661740374 is about 1184.4617955100.

The spelling of 1661740374 in words is "one billion, six hundred sixty-one million, seven hundred forty thousand, three hundred seventy-four".