1661025464 has 32 divisors (see below), whose sum is σ = 3567083520. Its totient is φ = 710319456.

The previous prime is 1661025461. The next prime is 1661025469. The reversal of 1661025464 is 4645201661.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1661025461) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 6104 + ... + 57959.

It is an arithmetic number, because the mean of its divisors is an integer number (111471360).

Almost surely, 2^1661025464 is an apocalyptic number.

1661025464 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

It is an amenable number.

1661025464 is an abundant number, since it is smaller than the sum of its proper divisors (1906058056).

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

1661025464 is a wasteful number, since it uses less digits than its factorization.

1661025464 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 64539 (or 64535 counting only the distinct ones).

The product of its (nonzero) digits is 34560, while the sum is 35.

The square root of 1661025464 is about 40755.6801439996. The cubic root of 1661025464 is about 1184.2919123646.

The spelling of 1661025464 in words is "one billion, six hundred sixty-one million, twenty-five thousand, four hundred sixty-four".