36403421561 has 4 divisors (see below), whose sum is σ = 39203684772. Its totient is φ = 33603158352.

The previous prime is 36403421543. The next prime is 36403421573. The reversal of 36403421561 is 16512430463.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 7948792336 + 28454629225 = 89156^2 + 168685^2 .

It is a cyclic number.

It is not a de Polignac number, because 36403421561 - 2¹⁴ = 36403405177 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (36403421581) 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, 1400131586 + ... + 1400131611.

It is an arithmetic number, because the mean of its divisors is an integer number (9800921193).

Almost surely, 2^36403421561 is an apocalyptic number.

It is an amenable number.

36403421561 is a deficient number, since it is larger than the sum of its proper divisors (2800263211).

36403421561 is a wasteful number, since it uses less digits than its factorization.

36403421561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2800263210.

The product of its (nonzero) digits is 51840, while the sum is 35.

The spelling of 36403421561 in words is "thirty-six billion, four hundred three million, four hundred twenty-one thousand, five hundred sixty-one".