158621321273445 has 24 divisors (see below), whose sum is σ = 278709974553816. Its totient is φ = 83439160777728.

The previous prime is 158621321273399. The next prime is 158621321273507. The reversal of 158621321273445 is 544372123126851.

158621321273445 is a `hidden beast` number, since 1 + 5 + 8 + 6 + 2 + 1 + 321 + 273 + 4 + 45 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 3557112932961 + 155064208340484 = 1886031^2 + 12452478^2 .

It is not a de Polignac number, because 158621321273445 - 2⁶ = 158621321273381 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 158621321273391 and 158621321273400.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 24143272404 + ... + 24143278973.

It is an arithmetic number, because the mean of its divisors is an integer number (11612915606409).

Almost surely, 2^{158621321273445} is an apocalyptic number.

158621321273445 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

158621321273445 is a deficient number, since it is larger than the sum of its proper divisors (120088653280371).

158621321273445 is a wasteful number, since it uses less digits than its factorization.

158621321273445 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 48286551461 (or 48286551458 counting only the distinct ones).

The product of its digits is 9676800, while the sum is 54.

The spelling of 158621321273445 in words is "one hundred fifty-eight trillion, six hundred twenty-one billion, three hundred twenty-one million, two hundred seventy-three thousand, four hundred forty-five".