1961567856 has 30 divisors (see below), whose sum is σ = 5489666000. Its totient is φ = 653855904.

The previous prime is 1961567849. The next prime is 1961567863. The reversal of 1961567856 is 6587651691.

1961567856 is a `hidden beast` number, since 19 + 61 + 567 + 8 + 5 + 6 = 666.

1961567856 is digitally balanced in base 4, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (1961567849) and next prime (1961567863).

It is a Smith number, since the sum of its digits (54) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 6810856 + ... + 6811143.

Almost surely, 2^1961567856 is an apocalyptic number.

1961567856 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

1961567856 is an abundant number, since it is smaller than the sum of its proper divisors (3528098144).

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

1961567856 is a wasteful number, since it uses less digits than its factorization.

1961567856 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13622013 (or 13622004 counting only the distinct ones).

The product of its digits is 2721600, while the sum is 54.

The square root of 1961567856 is about 44289.5908312551. The cubic root of 1961567856 is about 1251.7985535363.

The spelling of 1961567856 in words is "one billion, nine hundred sixty-one million, five hundred sixty-seven thousand, eight hundred fifty-six".