145978519681 has 8 divisors (see below), whose sum is σ = 146445142760. Its totient is φ = 145512540288.

The previous prime is 145978519679. The next prime is 145978519693. The reversal of 145978519681 is 186915879541.

It can be written as a sum of positive squares in 4 ways, for example, as 106351645456 + 39626874225 = 326116^2 + 199065^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 145978519681 - 2¹ = 145978519679 is a prime.

It is a super-2 number, since 2×145978519681² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (145978519651) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 295435 + ... + 615823.

It is an arithmetic number, because the mean of its divisors is an integer number (18305642845).

Almost surely, 2^145978519681 is an apocalyptic number.

It is an amenable number.

145978519681 is a deficient number, since it is larger than the sum of its proper divisors (466623079).

145978519681 is an equidigital number, since it uses as much as digits as its factorization.

145978519681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 321843.

The product of its digits is 21772800, while the sum is 64.

The spelling of 145978519681 in words is "one hundred forty-five billion, nine hundred seventy-eight million, five hundred nineteen thousand, six hundred eighty-one".