1661433634 has 16 divisors (see below), whose sum is σ = 2849332608. Its totient is φ = 711752832.

The previous prime is 1661433629. The next prime is 1661433643. The reversal of 1661433634 is 4363341661.

It is a junction number, because it is equal to n+sod(n) for n = 1661433593 and 1661433602.

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, 13419 + ... + 59185.

It is an arithmetic number, because the mean of its divisors is an integer number (178083288).

Almost surely, 2^1661433634 is an apocalyptic number.

1661433634 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

1661433634 is a deficient number, since it is larger than the sum of its proper divisors (1187898974).

1661433634 is a wasteful number, since it uses less digits than its factorization.

1661433634 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 48369.

The product of its digits is 93312, while the sum is 37.

The square root of 1661433634 is about 40760.6873592681. The cubic root of 1661433634 is about 1184.3889112468.

The spelling of 1661433634 in words is "one billion, six hundred sixty-one million, four hundred thirty-three thousand, six hundred thirty-four".