61523718901 has 4 divisors (see below), whose sum is σ = 61528050304. Its totient is φ = 61519387500.

The previous prime is 61523718899. The next prime is 61523718929. The reversal of 61523718901 is 10981732516.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 61523718901 - 2¹ = 61523718899 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61523718941) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2144325 + ... + 2172826.

It is an arithmetic number, because the mean of its divisors is an integer number (15382012576).

Almost surely, 2^61523718901 is an apocalyptic number.

It is an amenable number.

61523718901 is a deficient number, since it is larger than the sum of its proper divisors (4331403).

61523718901 is a wasteful number, since it uses less digits than its factorization.

61523718901 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4331402.

The product of its (nonzero) digits is 90720, while the sum is 43.

The spelling of 61523718901 in words is "sixty-one billion, five hundred twenty-three million, seven hundred eighteen thousand, nine hundred one".