1955663380 has 48 divisors (see below), whose sum is σ = 4493260800. Its totient is φ = 709084800.

The previous prime is 1955663371. The next prime is 1955663399. The reversal of 1955663380 is 833665591.

It is a Smith number, since the sum of its digits (46) coincides with the sum of the digits of its prime factors.

It is a self number, because there is not a number n which added to its sum of digits gives 1955663380.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 64045 + ... + 89515.

It is an arithmetic number, because the mean of its divisors is an integer number (93609600).

Almost surely, 2^1955663380 is an apocalyptic number.

1955663380 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1955663380, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2246630400).

1955663380 is an abundant number, since it is smaller than the sum of its proper divisors (2537597420).

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

1955663380 is a wasteful number, since it uses less digits than its factorization.

1955663380 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25840 (or 25838 counting only the distinct ones).

The product of its (nonzero) digits is 583200, while the sum is 46.

The square root of 1955663380 is about 44222.8829905966. The cubic root of 1955663380 is about 1250.5412866399.

The spelling of 1955663380 in words is "one billion, nine hundred fifty-five million, six hundred sixty-three thousand, three hundred eighty".