64146199441 has 9 divisors (see below), whose sum is σ = 64482007611. Its totient is φ = 63812134992.

The previous prime is 64146199417. The next prime is 64146199463. The reversal of 64146199441 is 14499164146.

It is a happy number.

The square root of 64146199441 is 253271.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in only one way, i.e., 13026798225 + 51119401216 = 114135^2 + 226096^2 .

It is not a de Polignac number, because 64146199441 - 2²¹ = 64144102289 is a prime.

It is a super-2 number, since 2×64146199441² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (64146199141) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 59011600 + ... + 59012686.

Almost surely, 2^64146199441 is an apocalyptic number.

64146199441 is the 253271-st square number.

64146199441 is the 126636-th centered octagonal number.

It is an amenable number.

64146199441 is a deficient number, since it is larger than the sum of its proper divisors (335808170).

64146199441 is an frugal number, since it uses more digits than its factorization.

64146199441 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2640 (or 1320 counting only the distinct ones).

The product of its digits is 746496, while the sum is 49.

Multiplying 64146199441 by its sum of digits (49), we get a square (3143163772609 = 1772897²).

The spelling of 64146199441 in words is "sixty-four billion, one hundred forty-six million, one hundred ninety-nine thousand, four hundred forty-one".