1661290734 has 16 divisors (see below), whose sum is σ = 3324816000. Its totient is φ = 553391160.

The previous prime is 1661290703. The next prime is 1661290751. The reversal of 1661290734 is 4370921661.

It is a junction number, because it is equal to n+sod(n) for n = 1661290692 and 1661290701.

It is a congruent number.

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, 83362 + ... + 101349.

It is an arithmetic number, because the mean of its divisors is an integer number (207801000).

Almost surely, 2^1661290734 is an apocalyptic number.

1661290734 is an abundant number, since it is smaller than the sum of its proper divisors (1663525266).

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

1661290734 is a wasteful number, since it uses less digits than its factorization.

1661290734 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 186215.

The product of its (nonzero) digits is 54432, while the sum is 39.

The square root of 1661290734 is about 40758.9344070720. The cubic root of 1661290734 is about 1184.3549538210.

The spelling of 1661290734 in words is "one billion, six hundred sixty-one million, two hundred ninety thousand, seven hundred thirty-four".