149478523751881 has 27 divisors (see below), whose sum is σ = 152036836439943. Its totient is φ = 146963105276400.

The previous prime is 149478523751789. The next prime is 149478523751929. The reversal of 149478523751881 is 188157325874941.

It is a happy number.

The square root of 149478523751881 is 12226141.

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., 128915382436281 + 20563141315600 = 11354091^2 + 4534660^2 .

It is not a de Polignac number, because 149478523751881 - 2²¹ = 149478521654729 is a prime.

It is a super-2 number, since 2×149478523751881² (a number of 29 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (149478523751281) by changing a digit.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 213236124831 + ... + 213236125531.

Almost surely, 2^{149478523751881} is an apocalyptic number.

149478523751881 is the 12226141-st square number.

149478523751881 is the 6113071-st centered octagonal number.

It is an amenable number.

149478523751881 is a deficient number, since it is larger than the sum of its proper divisors (2558312688062).

149478523751881 is an frugal number, since it uses more digits than its factorization.

149478523751881 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1942 (or 971 counting only the distinct ones).

The product of its digits is 541900800, while the sum is 73.

The spelling of 149478523751881 in words is "one hundred forty-nine trillion, four hundred seventy-eight billion, five hundred twenty-three million, seven hundred fifty-one thousand, eight hundred eighty-one".