1964654785 has 4 divisors (see below), whose sum is σ = 2357585748. Its totient is φ = 1571723824.

The previous prime is 1964654771. The next prime is 1964654819. The reversal of 1964654785 is 5874564691.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 5874564691 = 21613 ⋅271807.

It can be written as a sum of positive squares in 2 ways, for example, as 1349019441 + 615635344 = 36729^2 + 24812^2 .

It is a cyclic number.

It is not a de Polignac number, because 1964654785 - 2²⁷ = 1830437057 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 196465474 + ... + 196465483.

It is an arithmetic number, because the mean of its divisors is an integer number (589396437).

Almost surely, 2^1964654785 is an apocalyptic number.

It is an amenable number.

1964654785 is a deficient number, since it is larger than the sum of its proper divisors (392930963).

1964654785 is an equidigital number, since it uses as much as digits as its factorization.

1964654785 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 392930962.

The product of its digits is 7257600, while the sum is 55.

The square root of 1964654785 is about 44324.4265050322. The cubic root of 1964654785 is about 1252.4548632279.

The spelling of 1964654785 in words is "one billion, nine hundred sixty-four million, six hundred fifty-four thousand, seven hundred eighty-five".