1658788866 has 72 divisors (see below), whose sum is σ = 4197308544. Its totient is φ = 472071600.

The previous prime is 1658788849. The next prime is 1658788867. The reversal of 1658788866 is 6688878561.

It is a Harshad number since it is a multiple of its sum of digits (63).

It is not an unprimeable number, because it can be changed into a prime (1658788867) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 228391 + ... + 235541.

It is an arithmetic number, because the mean of its divisors is an integer number (58295952).

Almost surely, 2^1658788866 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1658788866, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2098654272).

1658788866 is an abundant number, since it is smaller than the sum of its proper divisors (2538519678).

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

1658788866 is a wasteful number, since it uses less digits than its factorization.

1658788866 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7436 (or 7426 counting only the distinct ones).

The product of its digits is 30965760, while the sum is 63.

The square root of 1658788866 is about 40728.2318054688. The cubic root of 1658788866 is about 1183.7601174488.

The spelling of 1658788866 in words is "one billion, six hundred fifty-eight million, seven hundred eighty-eight thousand, eight hundred sixty-six".