149802244721 has 4 divisors (see below), whose sum is σ = 151485416100. Its totient is φ = 148119073344.

The previous prime is 149802244693. The next prime is 149802244751. The reversal of 149802244721 is 127442208941.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 29227321600 + 120574923121 = 170960^2 + 347239^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-149802244721 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (149802244751) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 841585556 + ... + 841585733.

It is an arithmetic number, because the mean of its divisors is an integer number (37871354025).

Almost surely, 2^149802244721 is an apocalyptic number.

It is an amenable number.

149802244721 is a deficient number, since it is larger than the sum of its proper divisors (1683171379).

149802244721 is an equidigital number, since it uses as much as digits as its factorization.

149802244721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1683171378.

The product of its (nonzero) digits is 258048, while the sum is 44.

The spelling of 149802244721 in words is "one hundred forty-nine billion, eight hundred two million, two hundred forty-four thousand, seven hundred twenty-one".