61528373121 has 8 divisors (see below), whose sum is σ = 82065455584. Its totient is φ = 41005103040.

The previous prime is 61528373063. The next prime is 61528373141. The reversal of 61528373121 is 12137382516.

It is a happy number.

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

It is not a de Polignac number, because 61528373121 - 2¹³ = 61528364929 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 61528373121.

It is not an unprimeable number, because it can be changed into a prime (61528373141) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3442696 + ... + 3460521.

It is an arithmetic number, because the mean of its divisors is an integer number (10258181948).

Almost surely, 2^61528373121 is an apocalyptic number.

It is an amenable number.

61528373121 is a deficient number, since it is larger than the sum of its proper divisors (20537082463).

61528373121 is a wasteful number, since it uses less digits than its factorization.

61528373121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6906191.

The product of its digits is 60480, while the sum is 39.

The spelling of 61528373121 in words is "sixty-one billion, five hundred twenty-eight million, three hundred seventy-three thousand, one hundred twenty-one".