73203751561 has 64 divisors (see below), whose sum is σ = 84894137856. Its totient is φ = 62731468800.

The previous prime is 73203751553. The next prime is 73203751567. The reversal of 73203751561 is 16515730237.

It is a happy number.

It is not a de Polignac number, because 73203751561 - 2³ = 73203751553 is a prime.

It is not an unprimeable number, because it can be changed into a prime (73203751567) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 140505981 + ... + 140506501.

It is an arithmetic number, because the mean of its divisors is an integer number (1326470904).

Almost surely, 2^73203751561 is an apocalyptic number.

It is an amenable number.

73203751561 is a deficient number, since it is larger than the sum of its proper divisors (11690386295).

73203751561 is a wasteful number, since it uses less digits than its factorization.

73203751561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 802.

The product of its (nonzero) digits is 132300, while the sum is 40.

The spelling of 73203751561 in words is "seventy-three billion, two hundred three million, seven hundred fifty-one thousand, five hundred sixty-one".