815061821945 has 8 divisors (see below), whose sum is σ = 1117799070144. Its totient is φ = 558899535024.

The previous prime is 815061821921. The next prime is 815061822023. The reversal of 815061821945 is 549128160518.

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 815061821945 - 2⁶ = 815061821881 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 815061821893 and 815061821902.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11643740279 + ... + 11643740348.

It is an arithmetic number, because the mean of its divisors is an integer number (139724883768).

Almost surely, 2^815061821945 is an apocalyptic number.

It is an amenable number.

815061821945 is a deficient number, since it is larger than the sum of its proper divisors (302737248199).

815061821945 is a wasteful number, since it uses less digits than its factorization.

815061821945 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23287480639.

The product of its (nonzero) digits is 691200, while the sum is 50.

The spelling of 815061821945 in words is "eight hundred fifteen billion, sixty-one million, eight hundred twenty-one thousand, nine hundred forty-five".