3665621412 has 192 divisors, whose sum is σ = 10332241920. Its totient is φ = 1120521600.

The previous prime is 3665621411. The next prime is 3665621429. The reversal of 3665621412 is 2141265663.

It is a super-2 number, since 2×3665621412² = 26873560672225747488, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is not an unprimeable number, because it can be changed into a prime (3665621411) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 13937593 + ... + 13937855.

It is an arithmetic number, because the mean of its divisors is an integer number (53813760).

Almost surely, 2^3665621412 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 3665621412, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (5166120960).

3665621412 is an abundant number, since it is smaller than the sum of its proper divisors (6666620508).

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

3665621412 is a wasteful number, since it uses less digits than its factorization.

3665621412 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 511 (or 503 counting only the distinct ones).

The product of its digits is 51840, while the sum is 36.

The square root of 3665621412 is about 60544.3755604102. The cubic root of 3665621412 is about 1541.8751280431.

The spelling of 3665621412 in words is "three billion, six hundred sixty-five million, six hundred twenty-one thousand, four hundred twelve".