61815481325 has 24 divisors (see below), whose sum is σ = 82565028000.
Its totient is φ = 45638631360.
The previous prime is 61815481307. The next prime is 61815481331. The reversal of 61815481325 is 52318451816.
It is not a de Polignac number, because 61815481325 - 228 = 61547045869 is a prime.
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, 1743626 + ... + 1778724.
It is an arithmetic number, because the mean of its divisors is an integer number (3440209500).
Almost surely, 261815481325 is an apocalyptic number.
61815481325 is a gapful number since it is divisible by the number (65) formed by its first and last digit.
It is an amenable number.
61815481325 is a deficient number, since it is larger than the sum of its proper divisors (20749546675).
61815481325 is a wasteful number, since it uses less digits than its factorization.
61815481325 is an evil number, because the sum of its binary digits is even.
The sum of its prime factors is 40541 (or 40536 counting only the distinct ones).
The product of its digits is 230400, while the sum is 44.
The spelling of 61815481325 in words is "sixty-one billion, eight hundred fifteen million, four hundred eighty-one thousand, three hundred twenty-five".